Not him but I can as well throw in my setup.

For playback, I mainly use Navidrome.

For autotagging and importing (moving files), Beets.

For tagging edge cases, MusicBrainz Picard as the GUI and the Python tagging lib underneath it (mutagen iirc) with an LLM inside the pi cli agent for automation.

For format conversion and copying to portable devices, ffmpeg in custom bash scripts managed by an LLM.