Steam

That's fair, but I think it's a different argument. Benchmarks are an easy solution to the problems I presented. Your situation is a bit more niche, and while there should be a way to identify and track more niche hardware/software setups, I'm not sure a casual review saying "runs great on my rig" is exactly the place for it.

Conversely, I would think people who do use niche gaming setups (like gaming on Mac, for instance... or Linux) would be more than happy to share the details of their setup to help others as they would want to be helped.

Right, "more powerful" or "less powerful" are completely meaningless without context. E.g.: hollow knight has some serious bugs on the controller input (for some popular controllers like 8bit do ones) on the Linux version due to some outdated version of a library they use on some input modes. Silksong doesn't even register the inputs for that same setup. Both work perfectly on proton with the she hardware. Drivers and software play a more important role in playability than raw specs and benchmarks.

Maybe number of monitors/resolution/framerate/use of freesync or framegen, too, since that can affect glitches.

The problem with that is, this is highly dependent on the settings you set to play the game. Your system may have 4k, but you maybe play the game at 1080p with upscaling and RayTracing enabled. I mean this is just an example. Therefore it could be misleading information for many. There is a reason why even Protondb doesn't list that. In my initial reply and suggestion here I excluded stuff like refresh rate and resolution for that reason.