

Yes. It’s still needed. Mostly because not everyone using Linux is using a controller or other peripheral input device that just works natively (look at non-steam os handhelds and Bazzite for instance). On smaller screened devices, menus and keyboard specific options can be problematic regardless of other compatibility features.
I dunno. Perhaps because I don’t play a lot of games with exorbitant amounts of achievements but for me in games like Hollow Knight were sort of a roadmap. The thing is, you can just complete the ones you want. In my playthrough on the switch (where some of the achievements were just hidden), I didn’t get the same sense of having checked something off my list as I did when playing on steam. It’s almost like since nobody can really see them there’s no joy in it. But on steam I felt more pride in those same achievements.