Apples, oranges.

Koons didn't write a two paragraph description of his ideas and then handed it over to a porcelain factory that repeatedly tried to come up with something that fit the spec until Koons cried out "Yes, that's it! That's what I had in mind!"

He drew sketches, built models, shaped prototypes, etc. He was an active participant in the creative process from the very start to the end, not just a client that checked in on what the artists were doing from time to time to give the thumbs up or thumbs down.