What you say is true, but I should credit Valve for making many games “just work” when clicking the play button without involving more steps for the user.
I know some time ago, I had to set up a bunch of wineprefixes manually whether it was using Steam or Wine to play a game, but Steam’s automatic management puts it a little bit ahead now in my view. Even though Lutris makes managing it much easier as well compared to before, it’s still a few more steps that some users would get confused or frustrated doing.