I’m a hacky home hoster, who doesn’t work with linux professionally and has zero sysadmin background, so I have almost no credibility here, but . . .

For a decade, I hosted on Kodi on a pi 3, then I tried Plex on Pi 4 with sinks and fan cooling. It just wasn’t good for modern hi-def files, particularly h.265. I personally wouldn’t use a Pi for Plex today, unless the files were h.264 and limited to 720p, maybe 1080p.

A couple of years ago, I gave up and bought an Nvidia Shield Pro that was on sale. Plex on it has been pretty great, but it’s now getting long in the tooth, particularly as 4K files are increasingly available.

No idea where to go from here. I’d like something that is very low-power, like an SBC. Maybe a Mixtile Blade 3 or similar.