Brilliant reasoning. So there's no reason at all for the aftermarket for Apple products since they don't ship with these accessories?
It's a highly subjective matter. Use a screen protector if you want to. There is no one-size-fits-all answer. I use screen protectors as an added safety precaution. Accidents happen. Glass isn't unscratchable.
Tell that to owners of devices with scratched Gorilla Glass screens. Scratches do happen with normal use. None of the accounts I've run across involved "manual labor" or other extreme conditions that some in this thread have claimed are necessary. Using a screen protector is just a personal call.
...and be very careful using anecdotal evidence as proof of anything.
"It has never happened to me" != "It can never happen".
Poor analogy. My CRT has a matte anti-reflective coating. They're not mutually exclusive.