After installing Plex server (licensed) configured for internal network only, radarr, sonarr, docker, qb, jackett, homarr on Raspberry Pi OS without a graphical environment, it has been running continuously for over 2 months in a corner of the office. Although it could be a bit cheaper in my opinion, it is a good platform for a Media Center and more.
Tips: If you use it as a Plex media server with an external hard drive, connect it to the USB 2.0 port instead of the 3.0.
I don't have it for 4k playback, so I can't comment on performance. It's okay for up to 1080 though.
In the future, I will change its classic case to Argon Neo 5 with an integrated M.2 hat as an upgrade.
update 22/8/2024:
Upgrade was done and it was worth it. Pi still working without issues and now directly from an nvme drive without the sd card.