I find that Fedora hits the right balance of stability while being up to date for anything desktop and specifically gaming focused, Debian has different priorities and packages can be a bit too old. And it’s less of a faff than Arch.
Eh, aside from GPU drivers -- which I download directly from nvidia anyway -- I don't feel like gaming is much affected by the distro packages being a couple years old. We pretty much just run Steam, Discord, and Chrome on these things, and those all have their own update schedule independent of the distro.
Archlinux can be a pretty good choice for gaming. Not necessarily because of anything Archlinux does: most distros can do anything, if you configure them.
No, just because the Steamdeck's distro is built on Arch, and so you can piggyback on what they are doing.