Totally disagree with that analogy. When you type, do you leave your fingers resting on the keys or up in the air and only touch the key that you are actually pressing down? For all piano players out there, do you leave your fingers in the air, or rest them on the keys when you play?
I guess I hover my fingers over the keyboard and only touch the keys I'm actually hitting (yes, I touch-type and do touch the bumps on the F and J keys with my index fingers for proper positioning). If I rest all my fingers on the keyboard, I find myself naturally resting my palms on the surface below the keyboard and this is bad so I take them off.