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.
Forget the overheating — the fact that Macs will save all your work when shutting down, and will refuse to shut down if this is not possible (for instance if some app that doesn’t support autosave (MS office) has unsaved work, or if there are terminal jobs running). Can’t imagine how anyone tolerates their computer just obliterating their work.
I can guarantee you that a Mac will still shut down when its battery is empty. Unfortunately Apple hasn't yet cracked unlimited power.