I love MusicBrainz for everything they did but I don't think using a tagger as a separate program you have to open and point to a file is good UX, even if the tag lookup is fully automated.

It should be a daemon that auto tags all new files in the background and only prompts you when there's a problem. And if it finds a new song with metadata that's not in the database you get the option to upload it. Even better if it scrapes CDs and streaming services. Maybe I'll build it one day.