To complete your argument, you need to demonstrate that what the man with a degree can do with Photoshop is not super awesome. Maybe the skills transfer; maybe not. But at any rate you haven't demonstrated, or even argued that, they don't.
I don't think I need to do that at all. Demonstrating equivalence seems entirely sufficient.
EDIT: Wait, I totally misread your comment the first time round, and yes, from the position you're approaching it, the argument isn't complete. In the context of the original spoon/spade argument, I think I'd need to demonstrate that the person with the pre-2002 photography degree can't accomplish equivalent feats to a person with a contemporary photography degree, adjusting for experience.
In this case, it seems that the contemporary photography graduate has the adv...
Another month, another rationality quotes thread. The rules are: