I started pirating 30 years ago, sharing floppies. Since then I've gone through every method imaginable, from IRC to eMule, from Mega to Usenet, and the Arr setup is the very first time I can delegate downloads to another family member sitting on the couch: that's how smooth it is.
The only difference to your setup is that I use Jackett instead of Prowlarr, configure NZBGeek directly on Sonarr/Radarr, and use Kodi instead of Plex.
Ah, and nzb360 (or LunaSea) on people's phones. That's what makes it so any normie can use it. So long, streaming service salad!
I feel pretty much exactly like OP. It (Mostly) Just Works, and has for almost 20 years.
Also like OP, I think the snap transition has been thoroughly screwed up. It is the only reason that makes me - on occasion - long for Debian. I wish Canonical would just cure itself of NIH syndrome and drop it entirely. (Not necessarily in favor of flatpak or appimages, either. I like debs.)