This article by Jason Snell at Six Colors was a highlight of last week's Apple event coverage:
So when we look at the MacBook Pro and the Touch Bar, we’re seeing a very Apple approach to the problem. The Touch Bar exists because Apple doesn’t believe that making the Mac’s display a touchscreen makes the Mac a better computer. Instead, Apple created a new kind of control surface, powered by a custom processor and with extensive additions to macOS to support both system controls and contextual commands in the Touch Bar.
Apple's approach is a stark contrast to Microsoft's, which essentially is TOUCH ALL THE THINGS!