Sorry for the semi-revival but his thread has been playing on my mind. It seems so obviously wrong to me and now I think I've worked out why I feel that way, you obviously all need to know :o
In ym head, I paint lovely pictures and can draw and design and everything looks amazing. I have a good imagination. However, l cannot translate what's in my head into a piece of art. I can't paint, I can't draw, I don't have the patience for crafts. What I admire when I see pieces of artwork is the craftsmanship: how a person's eyes look alive in a portrait, or the perfect proportions of a sculpture, the way an impressionist painting perfectly conveys the atnosphere of a landscapel or the sheer patience of painting thousands of dots to create something beautiful.
If an 'artist' just gets to tell a bunch of assistants what's in his or her head and they use their own skill to transform those ideas into art, well that's something I could do. It's a bit like me telling an architect what I fancy for a loft conversion and then taking all the credit for the fact that it works and my house hasn't fallen down.
It's not the same as a designer who plans something and then gets craftsmen to turn it into a product, e.g. a fashion designer, jewellery designer, architect etc. They have to design something that works structurally, which takes a great deal of skill. Art doesn't have a particular purpose and it's entirely subjective: you either like it or you don't. The skill in art is taking something in your head and making it into a piece that conveys the same impression to other people. If it's assistants doing that, it's their art.