I've never run Plex, or Jellyfin for that matter. There's a video share on my NAS.
I point Infuse on Apple TV 4K's at it. It works, and cleanly.
Downsides: you have to pay for Infuse Pro to play some formats and deal with some audio codecs. It's IIRC $17 for a year, though, so pretty reasonable for continued development. Your non-technical friends and family can't do the initial setup themselves (it's shared over Tailscale, they can all use the same limited account on your plan), but anyone I'm going to let do this can ship me their Apple TV 4K and let me set it up for them.