2024 is the Year of Linux on the Desktop, at least for my boyfriend. He's running Windows 7 right now, so I'll be switching him to Ubuntu in a few days. Ubuntu was chosen because Proton is officially supported in Ubuntu.
It doesn't break often, it doesn't have problems updating it you don't update regularly.
It might be a bad choice for a first-time Linux user due to the heavy setup process/time post-install, but as a gaming platform it works absolutely fine. Steam Deck runs on Arch ffs, come on now. 😄
Curious: when was the last time you used Arch? Seems like you haven't used it of late, considering those misconceptions you spewed. Or maybe you are running experimental/unsupported stuff?
I've used it for over a decade now and had less problems with it than with Ubuntu that I ran for much less time before Arch.
I don't know what kind of issues Manjaro or Endeavor have had, probably plenty, but I'm running vanilla Arch for over a decade as I said, no issues. I update once a week maybe. I take a look at the packages that will be updated, and I do as the wiki said -- check the website for big news/manual intervention. Sometimes there's manual intervention, but they almost never concern me because it's due to something I don't have installed. This is standard routine for Arch, and if you don't pay attention then you are not using Arch properly. (I don't pay attention most of the time either, honestly, but it still doesn't break.)
I also use Nvidia and Steam (Flatpak) and it works great and I'm very satisfied. Works better than my Windows installation actually; better performance.
Arch being an unstable mess is a misconception these days since a long time, I think. It's been great.
I've updated old laptops with Arch that have been sitting for years without updates. I just run -Syu and it basically replaces every single package 😅, then I reboot into a fresh, working system. 👍 All good. Happened plenty of times.