Based on my few encounters with MFiT releases during this year, they seem to always have different barcodes when compared to Bandcamp, Spotify or other services which show barcodes. My view on barcodes on digital releases has leaned more towards keeping releases with different barcodes separate. So from this point of view it doesn’t matter whether MFiT has any real effect on the music files.
I believe that an implementation of release variants (as discussed somewhere here) can be a game changer for digital releases. I don’t think a separate thread was ever made for them but it’s a good time to bring the discussion back to the table.
Edit. Edge case found: https://musicbrainz.org/edit/56483517 (MFiT release which has the same barcode as on Spotify and Deezer)