I have an older XPS 13 with a glass screen (same design but previous generation) and one big annoyance is that every time you open the laptop, the screen will have grease marks across the centre where the keys have touched the glass while closed.
I've had this happen once, and the Apple store replaced the screen no questions asked. I usually use a microfibre cloth between the screen and the keyboard though. It's a problem with all (modern) laptops from what I can tell - my Thinkpad T480s suffers from it, though my X220 does not.
If you’re into that kind of thing, RadTech makes microfleece screen protectors and sleeves that are already sized appropriately for various Apple products.
