All my files are already tagged with Picard. It would be great to be able to update the tags on my phone. But currently it seems to match only based on basic metadata and does not take my existing MBIDs into account, which would in many cases lead to wrongly tagged files.

I suggest it should by default load release and recording data based on existing relase and recording ID in the tags, similar to how desktop Picard uses these fields to preload matching releases.