Not really a Linux distro. Based on Gentoo but not really a Linux distro, just like Android.

Using either ProtonUp-qt or ProtonPlus you can install newer/alternative Proton versions, including one optimized for Star Citizen

I recommend Fedora or openSUSE Tumbleweed.

Also seems to have way too many permissions. Maybe to work around some problem "flatpak"ing virt-manager?

Dying to a stupid bug is a great way to suddenly get frustrated though. Hard agree with you though, buggy games are my favorite. Especially small indie projects because I you can find the great bugs.

I also experience with Secureblue, so here are my answers:

• I used GNOME because it is the only DE that protects the screen copy API. I used GNOME extensions because native methods of customizing UI/UX are very limited.
• I personally re-enabl Xwayland because many apps (eg Steam) still use/require XOrg.
• Yes I recommend use and recommend Bubblejail as a simple way of sandboxing some apps. Not a "super tight" but much better than unsandboxed. FYI, AppImages don't work with Bubblejail, or Secureblue (cus they remove the unmaintained FUSE dependency).

Classic rap song at this point.

Only use it if you (can) read the the Flatpak manifest and make sure its safe. Clone the repo and build it yourself locally if you trust the code but want to recheck each update.

It tastes like dirt.

PCs aren't secure. Linux default isnt secure. Kali has so many apps/tools installed by default that it isnt comparable to default Linux. It has massive attack surface and no security design, therefore calling it secure isn't accurate.

If no effort was put into the security design of an OS, why call it secure?

Really fun/interesting read.

I used Tumbleweed for a long time as a daily driver and then as my admin workstation. Worked really well, GUI admin panels are nice, and I didnt find anything too difficult.