From your video, I didn’t see it try and reuse existing recordings, and looking at some of your recent edits, it looks like you’ve entered some duplicate recordings already. Just browsing through your recent additions, I noticed the release I Do You by Anna of the North which added 5 duplicate recordings, but thankfully another editor took the time to merge them: osdt.de
Those could have been real human errors, we’ve all accidentally added duplicate data before, but if they were added with this tool it could mean a lot of cleanup duty for a lot of editors.
There’s also the fact that Harmony is not perfect. Yes it is a great tool, but there are cases where it will show incorrect data. Could be as simple as a capitalization / style mistake to completely jumbled tracklist order. Things like these can be spotted by editors paying attention to what they’re submitting, but less likely to be picked up by an automated process.
Automated data entry has been discussed before, see Automating updates from other services - #4 by Freso and Spotify2MusicBrainz.py (pre-?)alpha testing release - #11 by reosarevok
and more recently - Hi there, sorry for breaking things