I recently got a corsair vengeance i7500, absolutely monster PC, never really had a top of the line PC before so I'm over the moon with it to say the least.
Of course I had to get a second nvme to use for playground stuff, and the first thing I did was put Mint on it. i've tried a few distros but always come back to Mint. It just feels good. Solid. Not as customizeable as the KDE options, but also not as flaky.
Steam working great, used Lutris to install battle.net and that is working. I miss HDR and framegen on my 4090. I miss not having a native MS Office option, because I'm sorry but Office just kicks ass. But office online is pretty solid, not as quite as feature rich but usable. I tried Thunderbird for email but just don't like the presentation that much so I'll stick with a web client.
Besides HDR and framegen the only thing I'm really missing right now is, strangely, the xFinity TV streaming client. I'm able to use published web apps for the other things that don't have native apps like disney plus, netflix, and they work quite well. But xfinity seems to be specifically blocking linux and that's a bummer. Did some searching but haven't found a workaround. It's one of the only reasons I haven't completely wiped the hard drives and gone full linux.
Oh and while all my peripherals work, this being a corsair PC it's got the LED and all that ... there's no icue equivalent, at least not one I'm comfortable using. That's not the end of the world, my cooling is fine and controlled via Bios. But can't change the lights
Overall, I'd say the linux experience, at least on linux Mint, is waaaaaay better than it was even 5 years ago. I think Steam & Proton have been game changers (pun intended). I'm now at the point where I can see myself using it full time, and at least over the last month have been using it a majority of time, but would be great if some of these secondary concerns could be addressed. Especially the continued implementation of nvidia features and gaming support.