Well, from my unofficial local sampling of 5E games, they only play the Adventure Paths. The vast majority of the DMs would never even consider using anything "homebrew" and will never make any "homebrew" themselves. There are a few DMs that will make and use homebrew, though a lot of them do so because of my direct influence. Most players also don't use 'homebrew' and don't want it in the game. A few do, but not many.
It's so bad that even when a gamer is unhappy about something in the game, and I suggest they simply change it, they have a bad, hostile reaction. The player does not like the level ability of their class. I say, well here are some alternatives you can pick from to replace that ability. And the player refuses to even look at them: "I don't need to see your homebrew!" It's so bad a player might make an Ice Sorcerer, but then be unhappy there are not enough 'cold' type spells. I offer for her to pick from my list of 100+ cold spells and her answer is "No, I will stick to the books". And you get a lot of the same with DMs. They are sad and complain that the in-the-book goblin encounter is boring. I suggest they add some custom goblins to the encounter, and even offer some copies of ones I have made, and they just say "no thanks".
Everyone seems to have somewhat of a good fun time in such games. Though it's sure not what I would call a good time.