One is that developers now a specific hardware + software combo to test their games with. Even if it’s the same build they’re sending out, they’re still testing their game on the Deck and fixing issues, leading to a better (but not perfect) experience for Linux gamers. Here’s a video of Swen Vincke, CEO of Larian studios playing a game released by his studio on the Steam Deck - https://youtu.be/kzfEkSGa45k. He’s very pleased and promises to test future games released by his studio on the Deck. And he stuck to that promise - Larian released several fixes specifically for the Steam Deck to make Baldur’s Gate III run better. Linux gamers benefit from that.
Second, this increases the % of gamers using Linux. After the Deck’s success in the last couple of years Linux is at 1.91% of the respondents of the Steam Hardware Survey for Nov 2023. Linux was at 1.15% 18 months ago. Doesn’t sound impressive, but if that growth continues and it reaches 3-4%, at that point developers will find shipping native Linux builds more attractive.
Studios don't care about native GNU/Linux, despite the games being shipped with Android/NDK, PlayStation POSIX environment, and the available APIs on Switch OS.
All of them much easier than porting from Windows/XBox, almost straight ports if coming from Android/NDK.
OSes are irrelevant these days and having basically libwindows.so these days only underlines that.
Valve only stresses the relevance of Windows.
In various benchmarks Proton is now outperforming Windows. There is no need for it anymore, outside some niche applications.
I know pretty well how Proton works.
From a quick search this is the best description of it I found: https://github.com/ValveSoftware/steam-runtime
Ah well, it's funny to see people complaining because it really solos out the OS you're using. Windows users have native DirectX, Linux users have near-flawless DXVK, and Mac users... well, Mac users get what Apple gives them, and they have to learn to be happy with it.
Game studios aren't FOSS indie devs stressing out about 3D APIs.
They are used to specific hardware since the Atari and Magnavox.
You should tell them that, they must not be aware considering all the APIs they pass over and platforms they avoid.
Food for thought, not even the studios targeting Android/NDK care about GNU/Linux, despite both platforms having the same 3D, audio and device API relevant for games.
It isn't the APIs that make them not care about GNU/Linux.
Let Valve do the needful for running them under GNU/Linux, if at all.