With such tight tolerances on the rMB, anything between the KB and display is asking for trouble. All being equal, and the rMB assembled correctly the keys, trackpad and display will never come into physical contact, equally the gap is very small, likely as little as 1/32"
Q-6
What about when you put the laptop in a bag with some other things in it? Isn't it the case that sometimes the laptop's screen is pressed onto the keyboard?