Finding a way to get the multiplayer studios to get Linux support for their competitive games like Valve does could crack a wedge in the market for mainstream users to get in, particularly in those who don't want to pay the Windows tax (not everyone is willing to experiment or go unlicensed).

I can't prove it, but the Steam Deck has probably torn down a lot of barriers for mainstream use among the crowd that care about the game more than the OS. Getting some of the other games (League, Vanguard, Warzone, BF6, etc.) or whatever is popular in those segments onboard might be the critical mass that justifies fixing all the rough edges that get fixed when a big pile of users are represented.