The 12-inch MacBook with Retina display is a marvel of engineering. It packs the power of macOS into a tiny chassis that weighs just two pounds. You can carry it and an iPad before you reach the weight of the 13-inch MacBook Pro.
There are, of course, trade-offs when it comes to such a small machine. The single USB-C port is a show-stopper for many, as is the under-powered — but fanless — Intel CPU.
The fact that compromises are needed to make notebooks thin and light is nothing new. Over the years, Apple has made several bold moves in this direction. Three really stand out.