I generally agree but the comparison can't be made that directly in my opinion because the small userbase of desktop Linux alone helps a lot there and the addition of repositories and Flathub do so too!
Definitely, you have to want to learn Linux fast and possibly a little more painful if you choose that path. Especially that SteamOS comparison annoys me, you spend basically all your time in a completely sandboxed environment with that (Steam uses Flatpaks for everything) so it has very little to do with Arch for most users!
They aren't unstable perse but there are always issues with some update and as a beginner with no clue about Linux I even struggled to solve Mints very rare issues, I think it's better to learn Linux first or that person might have a very frustrating experience!
It's better than it used to be but for gaming a Debian base can still get in your way and if you don't mind the change in interface anyway it might be worth checking out Nobora. That's a gaming focused edition of Fedora by Glorious Eggroll, the creator of a really cool version of Valves Proton called ProtonGE and highly regarded in the community! It's basically Fedora with a few modifications and great defaults for gaming and only a Gnome version.
Could be all kinds of people, right wing shit exists everywhere but it's especially on the rise in Germany rn with the right extreme party (AFD) growing rapitly in polls and the "conservative" party CDU leaning heavily to the right since they lost power.
For me as outsider they look even more desturbing, it's about a kids show and they dress up really fucking weard but I guess it could be a unfair assumption for om my side too, kinks are always kind of weard!
Guix isn't a Linux distro but it's definitely unique and probably for advanced users! :)