Fucking Lemmy.world is hot garbage. They’re down every day and are constantly defederating with any instance that doesn’t fit their narrow, sanitized world views. It’s also one of the most recommended Lemmy’s with more new users going there than anywhere else. I think it incredibly damaging in the long run to have 50% of active users on this platform to be centralized on one domain. Especially if this domain makes as many boneheaded decisions as lemmy.world
I think you are definitely getting into overkill territory here with a server rack dedicated to Plex and a GPU. Most igpus on Intel chips can transcode 10+ 1080p streams and 2ish 4k streams. Unless you have 100 users seems over kill to me.
Edit. I’m on Unraid with about 30 users, and I only give Plex and all my other containers 6 cores from an i7 10700k.