I disagree. The modern (read:1800s) horizontal milling machine was really what enabled the industrial revolution. The kinds of parts you can make cheaply on a lathe is much less diverse than on a mill with proper tooling. Don't get me wrong, you need parts with circles but all the other shapes are what really enabled the industrial revolution. Mills and the complex shapes they can quickly create allowed us to cheaply crank out the tooling to make all sorts of things.