Artist-Recording / Producer defines producer as,

This indicates an artist who is responsible for the creative and practical day-to-day aspects involved with making a musical recording.

Executive production is an entirely different role from Music/Sound production, at least from what I understand.  (Is that considered "practical day-to-day aspects"?)  If so, it seems wrong that these are the same relationship type, simply separated by one attribute.

I'm not sure if it makes sense to have executive producers on MB Recordings rather than only on MB Releases.  (Sound producer would go on the recording if that level of precision is known, else on the release.)

(Sometimes, booklets use the terminology "production manager" or "production director" instead of "executive producer", which causes these relationships to go into "miscellaneous roles / miscellaneous support" rather than "producer".  AFAIK these are the same type of role, yet would not currently use the same MusicBrainz relationship type tree.  I feel like having some kind of "executive / management" tree, separated from sound production, to catch these common credits would be beneficial.)