one of the most often example where we need this is when we want to move a artist-work arrange AR to the correct artist-recording arrange AR.

we can already change AR type.
we can already change any of the two entities.
but the entities can't change type, today.

being able to ↗ would allow only one edit instead of two (https://musicbrainz.org/edit/26169445 then https://musicbrainz.org/edit/26169452).