With my last last top, I had used it so much that eventually, the lettering on the keyboard faded away. I decided to prevent that with my new laptop and bought a silicone cover for the keyboard.
As you can see, if I use the silicone cover to protect my keyboard, it leaves grubby marks on my screen when I close my laptop. Lose lose.
Of course, I can remove the keyboard cover when I shut my laptop or do a number of other things, but then that would make my point redundant.