[seabrookmx]

You're assuming no game studio would test their windows executable on proton, just because they develop on Windows. If there's non-trivial market share to capture by being "Deck verified" I don't see why that would be the case. Game devs develop on Windows for PlayStation, Switch, mobile etc. At least with proton they don't even need to cross compile.

[pjmlp]

I am willing to bet that most don't give a damm about Proton.

[scheeseman486]

Microsoft test on and make considerations for Proton for a bunch of their releases. Sony do too. Cyberpunk has specific graphics presets, Baldurs Gate 3 has a native executable, indie games often do too.

There's outliers, it'd be fair to say EA don't give a damn. But a lot do and you can't handwave away Microsoft and Sony as small fish either.