You can connect navidrome and many other music players to listenbrainz.org. Like Spotify it creates an end of the year report and it also does recommendations like the weekly spotify playlist.

I know the type. Usually the kind of confident know-it-all who refuses to learn anything but delivers changes really quickly so management loves them. I had the misfortune to fix such a project after that ‘rock-star’ programmer left the company. Unfortunately the lack of professional standards in our industry allows people like that to continuously fail upwards. When I left the project they rehired them and let them design the v2 of the project we just fixed.