One thing nobody ever mentions, probably because it's not fashionable, is that all these buildings require maintenance after getting built. Maintaining a modernist block, with its flat surfaces and straight lines, is utterly trivial compared to more decorative styles - where you have to constantly fight pigeons and the elements to not appear derelict. Also, it is typically complicated to fix decorative pieces when they break, as they often do.
I do understand and share the view that the current mainstream is utterly boring, but I also acknowledge the (somewhat) irresistible forces that shape it: money, time, effort. And I don't believe AI can do anything to counter them in a significant manner, sadly.