Having this would have meant that MBS-2177 would not even been possible.

I disagree, this is not the proper fix.
This was made for a specific reason: avoid misassociating tracks <-> recordings associations (see MBS-661).
The current implementation has currently a few bugs which makes it very annoying, and there are other improvements that I suggested that could make it even easier (e.g. making a diff between old and new value, and not keeping current track <-> recording association if there are more than N changes).

OK, but will any heuristic be enough to keep the recordings intact if you change the whole tracklist to another language? Or is this simply so uncommon that it is not worth having the feature?

Adding translated tracklists seems common enough that there should be some way to do that with minimal hassle. Haven't really given that much thought yet.

Moving to 3 mo as per due date