So a better scheduler for gaming distros

CachyOS is not a gaming distro, it is a performance distro, and this is from the mouth of its own developers. Everybody thinks their scheduler is the best - there's probably a meme about it somewhere, you'd probably get more aggressive scheduling with gamemode than regular cachy because gamemode expects you to be playing a game when you use it... and fyi gamemode is used by default in applications like lutris.

SteamOS is a desktop distribution now, that means full compatibility - at least once they start supporting nvidia. Maybe when they supported only the steam deck they could afford some targeted optimizations, but the more systems start running SteamOS the wider the target will have to become.