Please understand that I haven’t tried or installed Arch Linux yet. From what I understand by reading and watching related videos, Arch is often breaks and a lot of time is required to fix issues. But I have also read comments from arch users who claim that arch has only crashed or caused them problems only a couple of times in a year.
Wouldn’t a stable or non rolling release distro be a great choice for the Steam Deck?? Also, how frequently do the packages get updated on steam os?
SteamOS is based on Arch but doesn’t follow the same release cadence, as well as using an immutable base OS and an A/B partition layout (much like Android) allowing for rollbacks. So the problems that an Arch user may run into are less likely with SteamOS, because it has some extra protections and testing that is done before it arrives on the user’s device (particularly with the stable channel).
And gaming distributions often prefer a rolling release setup, because gaming benefits from very recent kernel and GPU related packages (that aren’t always fully compatible with older/stable distributions), particularly with AMD hardware.