I am sure I have seen that on Dave’s TODO list for KODI. He has done a lot of work to better handle MusicBrainz tagging in KODI and there is more to come. There is only one of him so it is slow progress. Black Eagle is working on better boxset handling… which is making use of MB tags to define them. So I would not be surprised if the date question is close to their minds.
I’m bookmarking this as it sounds interesting. I often rename tracks or whole releases. For example: I want to know that I have a deluxe edition of a Release even if that isn’t important to MB. I want it tagged correctly so I can spot it sitting next to the standard release in KODI. Is that the kind of “personal value” you are thinking of?