Heat. Good for toasting marshmallows. Horrid for that laptop you want resting on your legs.
There's a lot of information inside your laptop. Information like that needs to breathe. Breathing needs air. Air needs circulation. Circulation needs specially designed air vented cavities. Since you can see a photo of a laptop desk over there, you can probably figure out exactly where all this is going.
But don't jump ahead! Specially designed air vented cavities need multiple height and angle adjustment! Multiple height and angle adjustment needs a release button! A release button needs a frame to hold it! A frame needs to be collapsible for easy storage and transport! Collapsing for easy storage and transport requires you have somewhere to go! Somewhere to go means you need a schedule! A schedule needs to be saved to your laptop! And your laptop needs somewhere to sit in order to prevent it from burning your legs with the heat that comes out of all that information!
And NOW you can look over there at the photo of the laptop desk. See? A little bit of politeness never hurts.