That's not comparable to a Macbook screen e.g. 3072×1920(!) on the latest 16 inch screen, and at 40% brightness you'd struggle out and about (which is where you need battery life, and again has no comparison to the macbook 500 nits)
Bigger laptop 16" more space for battery's, and yes in the Sun i struggle at 40% brightness. But 40% brightness is what i use 99% at time.
