I agree with you on most of this. However, couple points:
a. It was not uncommon for a noble to find disfavor with one ruler, find himself imprisoned and then perhaps a year or so later, re-emerge from his cell with his lands, fortunes, name, and offices restored following a change of authority. The English Civil War is a great example of this: Cromwell's Roundheads imprisoned many nobles for their real or imagined support of the Royalist side. When the Protectorate fell and the Stuarts were restored, so too were those nobles (the ones who survived to see it) by royal decree. Fortunes of fate in Royal Courts were not uncommonly fickle, Louis XIV at Verseilles comes to mind as another example. At different times, many of his nobles crossed him and did time in the dungeons, only to be restored months later when they were again needed at court, or someone else plead their case and begged Louis to let them out. Tyrion's arrest and restoration to the office of Hand to the King doesn't surprise me. However, both his and Jon's survival did. Grey Worm was a vendetta-driven killing machine in Ep. 5, and a confrontation between his blind loyalty to his Queen and Jon's idealism and humanity has been coming since Grey Worm broke ranks and led the Unsullied and Dothraki on a killing spree last week. How is it, upon learning that Jon killed his beloved Queen and liberator, Jon survives long enough for the ENTIRE STARK CLAN and every major Lord in Westeros to come to King's Landing for the council. Winterfell to King's Landing is almost two months' journey by land, and three weeks by sea. Sansa came with more men too, prepared to challenge Dany. You really want us all to believe that an army of freed slaves and barbarians wouldn't be wearing his skin as a bonnet by now?
b. Okay, Dany's original Unsullied numbered 5,000. Attrition, even the modest kind, had brought that to roughly 2,000 when they came to Westeros. This was mentioned when Jorah and Daario both acknowledged that her assumption of rule over 100,000 Dothraki fighters was a welcome change of fortunes. Following the campaign against the Lannisters, where Dany's forces were still reduced with every engagement, she should have had maybe 80% of that remaining. So 1,600 Unsullied and 80,000 Dothraki. Following the Battle of Winterfell, where we see most of the Dothraki eliminated in the first (incredibly asinine) charge at the Night King's army, we could be conservative and say that two-thirds (60%) was lost there. Given Viserion's cold fire barrages, these numbers now stand closer to 900-1000 Unsullied and maybe 30-32,000 Dothraki left. Where in the Faith of the Seven did she magically get legions of Unsullied? They were obviously the MAJORITY of her forces and looked pretty fresh to me. Their leaving, well, with their Queen dead, Grey Worm as their leader, was questionable. Not out of loyalty to the King though. Because they have none. None. Zip. Zero. None. They followed "Mhysa" by choice. They owed her no positional duty beyond personal loyalty. That doesn't translate over to some creepy white kid in a wheelchair they met six months ago, and certainly not because a bunch of other white people (some of whom they never met) say it does. By honest reckoning, given the assumed size of their army, Grey Worm being their leader - everyone heard it - and the losses inflicted among the 7 Kingdoms, if they want, they rule. Period. A professional, disciplined army with absolutely zero ties or loyalties to these foreign lands, stands larger and more prepared to hold power than anyone else. Even a unified attempt to repel them would be tough. So no, the murderous, vindictive, and rudderless Eunuch isn't going to sail away peacefully to settle on some island paradise in honor of his now shorter ex-girlfriend. This was recorded by some Maester as the "Whitening of Westeros' I'm sure, and it does leave a bad taste.
c. Tyrion's ending up as Hand is fitting. So too is the fates of Brienne, Podrick, Davos, Sam, and Bronn. But the Small Council needs: A Master of Ships, A Master of Coin, A Master of Whispers, A Master of Laws, A Grand-Maester, A Captain of the Kingsguard. So that works out, given Bran's statement of vacancies. So, in effect, no real change to the apparatus of government whatsoever has happened. The naming of Bran however, that makes NO sense. He shouldn't be interested in worldly affairs, as the Three-Eyed Raven, as you say, isn't meant to rule, he's meant to know and watch. Bran should have been the one to go north, back to the Raven's 'perch' at the top of the world.
d. Gendry actually made the best choice, given the scenario D & D created here. A legitimized bastard, he is - by albeit brief but entirely accepted royal decree - now the lawful son of King Robert Baratheon, making him a claimant to the throne...remember Robert's family's right was only in question for the 13 minutes and 30 seconds Dany was actually Queen. Gendry had clear right and claim. Being a Lord Paramount of the Stormlands, Lord of Storm's End, and heir to the Baratheon House, he also inherits Stannis', Renly's, and Robert's claims. His legitimacy was arguably endorsed by Dany herself. He is fit, can have an heir, native-born, and has zero history of offending anyone. No one would question the choice to put a virile, handsome, and healthy young prince on the throne, particularly when you look at it from every angle he is the most practical choice. But they choose a cripple, whose family has now rebelled against four of the last five monarchs, waged war across half the country and against most of the Lords-Paramount at some point or another, who has no claim, no chance for heirs, nothing.
e. Arya's leaving makes sense. Northern Independence does not. If Bran the Broken is gonna be king, he is a STARK. Last male heir of Ned Stark. Lord of Winterfell. How many times have they reiterated this this season? If Jon frankly is NOT a Stark is now common knowledge, as Varys predicted, then Bran is rightfully the King In the North. Period. Lady Sansa would remain Lady of Winterfell and Lord-Paramount of the North with his ascension to king, but the North would be swearing to a Northern king, a Stark king, and still have a Stark at Winterfell to speak for them. They haven't been this secure in their identity and assertion in 300 years. Why leave now? Because Sansa wants a tiara. Period.
f. Night's Watch -- watching what exactly? A group of exiles, bastards, and second-chancers form a small army loyal to no one kingdom, dedicated to the protection of Westeros and all 7 Kingdoms evenly. Um, the wall fell...in part. Eastwatch-by-the-Sea is GONE, along with about a quarter mile of wall. The Wildlings are friends now, and Tormund is their leader, making their loyalty and peaceful coexistence pretty likely. The Wildlings were not north of the wall by choice originally. They did not WANT to be there, hence Mance Rayder's entire soapbox to unite them. They wanted to go south due to the Night King's coming. Well, he's gone now. Nothing to guard against, no impetus for invasion, no desire to keep the Wildlings out and no reason they would stay out. The Night's Watch is an utter waste of manpower for a Kingdom in shambles, with every major military decimated. What makes sense is making them stay in King's Landing, protecting the realms of men by serving to ensure and maintain justice across Westeros, protecting it from invasion, and restoring order. But no, let's just send people to do nothing, in the least needed and most useless place we can find. It is a missed opportunity and one which - with Grey Worm and the boys sailing off - is sorely needed. Bonus point: Grey Worm is gone...why is Jon still in the North? Worm's not coming back, ever. Jon being brought back out of exile to live quietly among his family at Winterfell makes sense.
Okay...done...it was a hurried, poorly developed (character and plot) season that was rushed to find the most fast, easy, and direct way to resolve open storylines, distract you with epic FX and battles, a few quick tugs at heart strings, and then be done. 7 seasons of finely-crafted, complex, rich storytelling wiped out in 6 episodes of garbage TV. What exactly did Hodor hold the door for?