RP, if Stella did not know how to draw, then by definition much of the placement of the elements of his painting is on the support by accident. In that sense, that what he did was beyond his control, it cannot even be art. IMO.
I don't know, it seems to me that if people who can't even draw are considered "presitigious" by the modern art world, while those who can are scorned, this says more about the new "academy" than anything else.
Stella measured and composed his early works. He did know what he was doing. Because he may not have been trained drawing nudes does not mean that he did not create some fine pieces.
Pollock said that new ideas take new means.
But I'm not sure if this is a good long-term development (as you point out quite frequently). And right now I don't have time to explain this piece. It is called Die Fahne Hoch (Black on High).