This just sounds like the AI is just not good enough yet. I mean it's pretty clear now that there is nothing stopping AI from producing close to or sometimes even exceeding human artists. A big problem here is good training material
I didn't say that. I said that AI is capable of sometimes exceeding human artists. That is not the same thing as saying AI is exceeding the best human artist. If your training material is of high quality it's shouldn't be impossible to exceed human artists some or even most times, i.e. Produce better material then the average or good artists.
I think it's almost inherently so, because of the care that an artist takes in choosing keyframes, deforming the action, etc.