Earlier quoted context omitted.
No, then they tell you about all the not-working AAA-games they boycott and why that somehow hinders them of using Linux, which they by the way already tried in 1995 and it didn't work out back then so why should it now?
Hasn't Steam Deck pretty much solved that problem by shoveling such insane amounts of money into Wine/Proton that it is able to pretty much run everything you want in terms of games?
There are still a lot of issues playing games outside of Steam, and not every game is available in steam.
As someone else said there are some issues with anticheat (but some do work).
It is also not unheard of for a game to have an update and it break the proton compatibility. Meaning anyone who wants to play the game has to wait for proton to update with a fix.
But also, not every game on Steam works either.