Think of it this way: every time an extraordinary person joins your company, they’re closing to the door to some other opportunity. And unless what you’re proposing is the best use of that person’s talents, you’re giving the rest of the world the shaft.
…let without some very clear, rational purpose, and you shouldn't accept a designer doing so either. Making stuff look good is not a goal in of itself. Neither is striving to be innovative. These are byproducts of doing the thing that actually matters, which is, namely, solving a problem.