I am reluctant to be such a bringdown, but I have become convinced that the metadata that Roon is licensing is simply terrible. There are so many errors and inconsistencies that it NECESSITATES the ability of the user to, by default, prefer the user metadata to Roon’s as the music is being scanned.
I could give so many examples of particular errors I think I could persuade anyone that such a default import function is required.
(I might be able to convince the great people at Roon to find a better source of data but perhaps there simply isn’t one that is better than their current source. So in that case again I plead for a choice to prefer my own, carefully cultivated and maintained metadata over the poor metadata supplied by Roon and imposed on my library.)