There are builds for Android TV lineage os for the raspberry pi. If you are willing to put in some work for alternative apps it’s a great interface with no Google integration. I’ve used kodi before i moved to jellyfin always found the kodi -> jellyfin integration to be clunky. Google TV would be much cleaner

Have you thought about log aggregation with something like Prometheus/graphana or ELK?

Lol thinking about cpu notifications for myself. I get notified when the fans ramp up on my server.

Nexus 5 peak android customization, I had cyanogen mod dual booted with stock android.

My old palm pre was amazing webos ui was way ahead of its time, super customizable, independent from google, Facebook and everyone elae, all in a sleek package with a physical keyboard. It had many other issues but it took android a few years to catch up so their UI wasn’t as clunky.