I've got a sleek option because lugging around a brick is a miserable experience. There's a qualitative difference between the XPS 13 that I can whip out on the train, and a desktop replacement laptop that is heavy and big enough to be a bother and barely fits in my backpack.

Power isn't really an issue - I'm never far from an outlet, and I could carry an external battery in a backpack pocket if it really bothered me.