I was listening to the Rusillo podcast recently, and he mentioned that Embiid is currently leading the league with an average of 10 post touches/possessions per game. Five years ago the leader was Al Jefferson with 20 per game. So, in five years, it would seem that average post possessions have been cut in half--and that's for teams with great big men (Embiid probably being the best big man). That's too much of a monoculture within the league, and too drastic a change. It makes gameplay uninteresting. Styles make fights, and there is currently only one style. It becomes boring and predictable.
And, the paint is wide open right now because no one has to defend it. A real big man could feast in this era if they were surrounded by shooters. Now, the caveat is that they would need to be a really good passer, because the double would be coming quickly once they got rolling. But, guys like Webber, Timmy, Hakeem, young Shaq would just destroy the league right now. Any big who could score in the post, pass, and hold up in the P&R on defense would just dominate. Hakeem would be insane in this era, and he was already a top 5 player in my lifetime from his own era. I'm crossing my fingers that one particular young big man from last year's draft can develop into that player (and I think he can).
Anyway, you need post passers/scorers to get the real exquisite backdoor cuts and motion offenses of yesteryear, and I'm hoping we can return to some of those teams in the near future.