> About 3/4 of my library is marked with “no” on their compatibility chart
It's unlikely as they haven't checked that many games, I suspect most of your games are still "unknown" (but are very likely to just work in practice).
Anyway you're very unlucky with your library, in my case most of the games work out of the box regardless of the rating, and most of the games marked "unsupported" can be played by changing the proton version or using protontricks.
Did you check ProtonDB for full stats about your library?
> most of the games marked "unsupported" can be played by changing the proton version or using protontricks.
I'd call that "unusable" if you need to tweak it. It's possible for power users like me or you, but if it requires some knowledge of computers, or being able to google an error message or visit a forum to look for solutions, it's way beyond usable for most people.
I'd say using any tweaking at all would for most people fall under "nope". It's only enthusiasts that can do that.
My point remains: only enthusiasts who are ready (and able) to tweak even small settings - particularly e.g. visit a forum or google the occasional error would this work for.
Let's measure it this way: how frustrating would an average non-power user find the desktop Linux gaming experience today? I'd argue that while it's a lot less frustrating to them than it was a few years ago, but it's still not so frustrating when put next to the windows start menu ads frustration.
It's unlikely as they haven't checked that many games, I suspect most of your games are still "unknown" (but are very likely to just work in practice).
Anyway you're very unlucky with your library, in my case most of the games work out of the box regardless of the rating, and most of the games marked "unsupported" can be played by changing the proton version or using protontricks.
Did you check ProtonDB for full stats about your library?