Adding repos can just be done inside a Toolbox, or even as Overlays. Grub can also be edited and changes applied to immutable OS’s like Bazzite/Kinoite. I’d definitely say give it a shot on a non-daily driver machine and see how you like it. Having the option to mess with the underpinnings can be nice- but not having to has a lot of value as well.

I know, right? It’s so hard to “really” mess something up and Toolboxes are very cool for things not served by Flatpaks or Overlays.

Regarding your not wanting to go with an immutable distro: what configs are you thinking you’ll need to mess with that makes an immutable distro a bad idea exactly? I was previously on the fence about it as well but Bazzite has absolutely served my needs and requires way less fiddling than my previous Nobara install did after major updates. I have yet to find any day to day configurations that I haven’t been able to overcome with OSTree overlaying. Aside from being immutable, Bazzite literally checks every other box you’ve got listed.

hunter2