I think that’s different. The disambiguation is subjectively edited to be what the editor thinks is a concise way to declare that this X is, or is not, the X you’re looking for [1].
- For some groups, that may be the begin area, but for many groups, it won’t be.
- For some groups, that may be their (super-)genre of music, but this isn’t exactly machine-readable.
- For some groups, that may be the start date, but for many groups, it won’t be.
I don’t think anyone could reasonably argue that the most effective way to disambiguate X from X is to store its Latin script transliteration.
Footnotes:
[1] unless you have an unpopular guideline like Style / Specific types of releases / Soundtrack - MusicBrainz that misuses the disambiguation field, which most users neglect to implement in their editing, and which most users refuse to vote yes on when others do.