There are 2 issues as I see it:
1. Some people are saying that embellishments are OK, but not when they are musicially incorrect (such as a natural 13th on the V7 in a minor key, or a #4 on a major 1 chord).
This I agree with, and we will work on improving that. So that's like a bug in the program.
2. Others are saying that the chords should never be embellished, if it says C7, then the players should only play chord tones C,E,G, Bb. I don't agree there, since that's not how musicians play. For that, we can make "simple variations" that will play close to what is wanted, but it helps if you can identify styles (realTracks) that are in need of simple variations.