This is one product at a specific price point. Hardware wise, this thing is a cell phone with a really nice screen, a full size keyboard and a gigantic battery. Could they have made the battery a little bit bigger? Probably, but I'm sure they have detailed metrics on how often people charge their laptops. Apple doesn't strike me as the type of company to make arbitrary design decisions. Hate them all you want, but they don't do things without research.

And Apple laptops already give really good battery life: my 2014 retina MBP gets 6+ hours on a full charge -- and that's while running VMWare Fusion with 2-3 VMs. I have yet to see a Windows laptop give anywhere close to that battery life under that type of load without a bulbous battery pack protruding from the back.