Valve building their own Android for games is not beneficial to Linux. I don’t know how many times do you guys need to be surprised.

? When did I suggest they did anything of the sort?

SteamOS is just Linux running Steam in Big Picture mode in a separate virtual desktop from desktop mode, with the root fs in read-only mode to prevent users from bricking it by tinkering. That's it, you can get pretty much the same thing with Bazzite. I use Linux on my desktop (openSUSE Tumbleweed), and games run the same as on my Steam Deck, but I could also get the same setup as SteamOS if I used something like openSUSE Kalpa (KDE) or Aeon (GNOME), which also has a read-only filesystem.

I’m not going to argue any further because it’s pointless

Well yeah, because every point you've brought up is either wrong or completely overblown.

I really don't understand what "mistakes" you're talking about. Steam offers a great service, better than everyone else. If that stops being true, I'll buy my games on another service. I was just fine w/o Steam for years when I first switched to Linux, and I'll be just fine w/o Steam if they ever screw the pooch. For now, they have an excellent service for users, publishers, and developers, and their competition is subpar for all three.

I have hundreds of free games from EGS and hundreds of games on GOG, so I won't be hurting for something to play if Steam ever decides to go evil. But for now, I'm getting really good value for the money I spend, because gaming on my OS of choice is way better thanks to Valve's investment, and I have no problem rewarding that.