Well the issue is compounding supplements.Fair enough. Not really a thing for the traditional RPG model then. That explains why I don't know much about it, since I tend to ignore games designed like FATE.
Like someone said, a Superhero game can pump out content because there are tons of superpowers. Same for 4e, they just pumped out new build. Old stuff barely got supported later. Sidegrades in anything. PF2E just makes new classes and is strict against supporting old content with new content.
It's funny.
5e got to major power creep in a few books. And it's only the glacial publishing schedule that hides it.
And it's all because of no new classes.