Justice and Rule
Legend
I've found that people who play Pathfinder are MUCH more likely to be AP-people than homebrew people. Perhaps that's wrong? Even what I've seen from PFS is largely written this way.
I would not use PFS as an example for the reasons @billd91 describes. But I'm sure, compared to other D20 systems, a lot more PF people are AP people because one of Paizo's big strengths is supposed to be their adventures. Hell, I remember running a decent portion of one (Wraith of the Righteous) back when I was running 5E because I didn't like 5E adventures at all. I modified it a bunch, but I'm one of those guys who isn't normally an pre-made adventure guy.
I'm not sure the evolution of a game system put out by a company that is, in many ways, as known for their adventures as their actual RPGs is as separated out as I think you imply here.
Sure, but I also think that modifying AP format and such is something that has been evolving at a slower pace. It's been only recently that they've played around with how many chapters/books their APs are. That aspect of their business is something they are clearly more worried about modifying than the rules, but they are slowing getting there.