To understand this, alchemy has very set-in-stone principles of use. I suggest looking through all the alchemy subs that have been approved before you seek out doing something crazy, like a dark-side powered energy shield or something. Everything with alchemy is a lot more complicated than simply making it do something, technology is a lot less complex in that regard. I could put a power supply into a shield generator and be done with it, or I could get a force crystal or something, make a special receptor that takes in electricity, and go through a bunch of steps and jump through a bunch of hoops to make that force crystal project electricity while in proximity to the force or something.
It all boils down to: Which is more practical in writing a submission?