What I’m saying is that personally I don’t think your proposal would improve my tagging strings, it makes then less predictable and consistent. Speaking as a someone who uses MB to tag their music.
I like your alternate suggestions, such as supporting abbreviations (I feel like there must be a way do this already, eg a plugin, using the existing db), or allowing editors to attach values to different artist credits. But in a practical sense they also pose their own problems. But I’m not sure if you are pursuing those suggestions at this stage