My bone of contention is that a large part of uke's role should be to simulate an attack. That is a situation of disharmony. Whether they are using internal aiki principles or not, in order to allow nage to train effectively, there needs to be some disharmony created. That's all I mean.
*shrug* If there were no disharmony in the world, then martial arts would be unnecessary.
As I pointed out upthread, it's entirely possible for the nominal "nage" to be the initial source of disharmony, and that uke's "attack" is actually his attempt to defend himself and restore the balance.
I just haven't found the attitude that "uke is being un-aiki" to be conducive to good ukemi, OR to good training for nage.