It could be 99% of games and it wouldn't matter if the remaining 1% are what people actually wanna play. Support for games outside of Steam is beyond the capabilities of most PC users. Most people don't actually enjoy playing Troubleshooting Simulator.
Wtf, those launchers play games without issues outside the Steam? What are you talking about?
And if that last 1% of games does crazy shit, it can stay on Windows. There is no need to fully support everything from Windows (down to exploits) on Linux.
Can I just go to gog.com, download The Witcher 3, click on the installer and have it install? Or do I have to configure some bullshit that's beyond the capabilities of the regular user before I can do that? You seem to be completely disconnected from real people. Real people also don't care about what kernel anticheat does and just want it to work.
I have played a game from GOG on Linux (Icewind Dale), it had Linux download, I opened it and the game played 100%, even multiplayer with non-Linux users.
It doesn't. But congratulations on showing that Linux gaming outside of Steam is at exactly the same stage as it was years ago: Most titles don't work.
Again with this. You can look up the solution, I can look up the solution. Mr. Regular Joe who just got off an 8 hour shift and just wants to play games for an hour doesn't know or care to know what Wine or Lutris are. You need to get out of your bubble.