That's not the point. Some people carry their laptops around on buses, on their backpacks, bicycles, wherever. It's advisable to be smart and have some extra protection. Just because you never had a problem doesn't mean others won't. I've seen plenty of cases where someone bumped or dropped their backpack and their temps shot up to 100C or LM wound up getting outside of the heatsink. Better to do things the right way instead of trying to live life on the edge in a careless way.