But Proton is not one API. There is a reason why Valve maintains multiple Proton versions and keeps them around. Cleanroom reverse engineering Windows is a moving target. They are at developing Proton 10. How long can they keep it up to maintain old Proton versions for old games while advancing Proton for new games? Will the workload break them at Proton 20?
Steam Linux Runtime is a less moving target. Valve bases a new SLR version on every second or so Debian release (IIRC SLR 3 uses Debian 11).
But there are bad ones. For example Ubuntu and derivatives broke Flatpak support in 25.10. This was known ahead of release but because only Snap matters, the fix will only roll out after release.
I recently installed Slowroll in Steam Deck's Distrobox. First day and yt-dlp was already too outdated.😅
Adding OBS repos got weirdly broken since the last time I did it. Some packages cannot be forked into one's home repo because they are on openSUSE's git and zypper ar does not add the repo type to the offline file, so zypper ref complains about an unknown repo.
In the end I found some other repo containing a recent version of yt-dlp that I could fork into my home repo and edit the file in /etc/zypp/repos.d by hand. I assume this is transition pain during the move from OBS to git. I hope they'll get this done soon.
And yet Microsoft and all PC OEMs panic at the existence of Steam Deck and throw resources at Windows-based competitors.