Just for the sake of argument it is not always the artists fault some times the meterial can be at fault.
There is a now famous sculpture by I think Michael Angelo of Christ. He started the sculpture from the feet up and when he got to the shoulders he found a magor flaw in the marble that he had used. In disgust he got rid off the piece and it was finnished by lesser artists. It was lost for many years but is now displayed in some church. I am no expert and I am unsure if this fault in the meterial was possible to be picked up at an earlier stage but you would think Michael would have taken every precaution when choosing the meterial!
http://cgfa.sunsite.dk/michelan/p-michel17.htm
I do agree with you though Al but I guess nothing is ever black and white
