If you find yourself wanting to game on your distro again, layering nvidia drivers ontop of immutable fedora is do-able. If you want a more hands off approach you can use bazzite (https://bazzite.gg/), which has an nvidia compatible version and is just a kinoite-based OSI image with gaming oriented tweaks and extra apps.
You can even just rebase to it if you're already using kinoite (and rebase back to kinoite if you don't like it), no need to reinstall your system. The download page has a one-command exemple on how to do that.
Yeah entirely agree. I don't get why the current mods can't simply be removed since they don't intend to maintain the sub? Sublemmys can't really move, you can just create a new one elsewhere as everyone is welcome to do, but by definition it can't be the "same community"