Valve and CodeWeavers today released Proton 10.0-4 as their newest update to this downstream of Wine that powers Steam Play for running Windows games on Linux.
Proton 10.0-4 enables more games to now work on Proton stable with the games below having only previously worked on Proton Experimental. Plus there are dozens of game-specific fixes as well as fixing some earlier Proton 10 regressions.
This seems to me an application of the 80/20 rule. Valve (and its infrastructure) is taking it the last 20% needed to make it mainstream-viable.