As others have said I doubt you will see a difference but I can attest to arch working just fine for gaming. Between steam and Lutris I haven’t run into any real issues.
So if you’re wanting to try arch go for it with confidence that your gaming experience likely won’t be impacted.
I’d have to agree with this, there was a time where Plex was amazing. after like the 3rd time I was forced stop it from hiding my library and them pushing services in my face I made the switch to Jellyfin. It’s been long enough now that I don’t recall the features I miss, and overall Jellyfin is fine, and seems to get better pretty consistently.