Earlier quoted context omitted.
This is the literal reason I switched to OSX. I dislike the impractical design of Macbooks - horrible connectivity and no way to swap batteries. However the combination of 15 hrs battery life + closing the lid and it not melting a hole in my bag trumps any negatives.
Be careful. My Macbook Pro cooked it's display twice. Some program made it not go to sleep when I closed the lid, I put it in my backpack, and it overheated the display so much that I had yellow-brownish spots (which followed gravity over time). No way to check if it's sleeping when the lid is closed, because reasons...
I do have my MacBooks cooking themselves in my backpack every so often too.
Basically, every MacBook's I had in the past > 10 years ended with that issue.
Mystery solved!