I will second Bazzite, with the additional note that I’ve needed to use Feral Gamemode to get rid of microstuttering and other minor performance issues. But, that’s not really different from any other distro I’ve tried gaming on (Void, OpenSUSE Tumbleweed, Funtoo).
Yep, this is how I do it on my NAS, which is some RockPro64 board attached to WD Red spin drives. I have music, movies, game saves, documents, pics, etc. that equal around 1.5TB and I don’t seem to get excess scanning when “watch files” is turned on.