.. possibly, there are other 'hard-coded' situations precluding this from being delivered.
I'm pretty sure that's still the case at the moment, at least until such time as the "all tracks are equal" case is delivered.
I can think of a few things that are at least closely-tied to specific tracks ... the Bass MIDI offset, Drums, Melody, Soloists, Thru.
Some of those things are, I think, already part universal, some, I think, are not just yet.