HDR support is supposedly fixed on kde and should be getting fixed in most other distros soon supposedly.

Unity worked for me on pop os after some fiddling and installing of dependencies, but it didn't fully work. There was a bunch of tools (like animation keyframes) which just didn't display correctly for me though. Checking out the source code of one the util did a check to see whether it was running on windows or Mac, then exited if it wasn't either of those. Would be good to run it via proton if possible so we get full support without the Devs needing to write tons of code to support a small percentage of users. That experience is pretty common when running Linux as your main, but the other benefits make up for it.