Why can't MB do the same?
MediaMonkey is commercial software that has a team of paid developers.
MusicBee is free, unrestricted (not 'crippleware'), created and maintained by one person in his free time.
If you had done some forum research, you should have found that MusicBee makes no claims to be compatible with iStuff, puts no efforts in doing this (anymore that is, perhaps efforts were made many years ago), and more importantly: why that is the case.
(in a nutshell: because of Apple making this difficult and keeps making it difficult on purpose. They love their limiting garden wall and are putting in a lot of effort and millions of dollars to keep their users locked into their own eco system)
Hats off to MediaMonkey though.
It's very nice software, and anyone with iStuff should really consider trying/using/buying it.