On the other hand, a driver is supposed to be a low-level interface to hardware. iTunes is not adding a new CD/DVD burner, so why would it presume to know more about the operation of your CD/DVD burner than the manufacturer, who presumably wrote the driver already installed on the system?
Daemon Tools needs to install drivers because it is adding fake hardware -- a fake CD drive that needs to be indistinguishable from a real one so that it can circumvent physical copy protection. I'd be surprised if iTunes needs to do the same thing.