i had a whole thesis ready to go for this but reading the replies kind of took the wind out of my sails.
I think people are being a bit too combative and argumentative over what is essentially just a suggestion to adjust their frame of mind for how they approach their story mapping so that they don't find themselves dropping a dominion (or whatever faction thread) after X posts out of lack of interest. If you find yourself disinterested with a particular thread "type" (as in dominion, invasion, etc) then consider changing what you are doing in that thread, not in the sense of what your character is doing but rather how you, the writer sitting above a keyboard, is utilizing your character in your writing. This doesn't necessarily stop with individual writers, though, if each successive dominion a faction launches ends at the 30ish post mark and everyone is just kind of phoning it in and not really enjoying themselves then it's up to the people who run that faction to turn things around. Nobody is perfect, you won't appeal to everyone, and you don't necessarily need to try to do it all the time (the wheel must keep turning, even if it has to be a slog for a thread or two) but it's you (no, not you) who dictates how your faction threads work.
And, yes, there is nuance to posts being cut short - people have lives outside of chaos that can dictate their free time, they also have interests which can grow or shrink at a whim. People will stop posting to you, sometimes, even if they don't want to - and especially when they do - and we just have to accept that as a fact of life. Sometimes, however, we also need to realize that we are that other person in the situation and understand that, sometimes, our approach to a thread can change how much we want to continue posting in a positive way. Nobody is asking anyone to do something they don't want to do, just to consider other avenues for how you join and partake in threads on chaos so you can get the most of your experience in a way which might possibly maybe motivate you to keep posting a couple more times, which might just maybe possibly potentially keep the other people you write with posting too.
(I had 14 paragraphs but I deleted them all and wrote this instead.)