Keyboard shortcuts are part of system mastery. As you get better at using a system and are looking for better, faster ways to do things, they work great.

But they are not intuitive, they require the user to "memorize" certain arcane commands if you want to use them. That's why more than half of all users do not use a single one. (A Mozilla study referenced somewhere in Atlantic magazine a while back put the number at 90% who never used Ctrl-f to search a webpage, and around 70% who never use any (although that seems a bit high to me), hence the push to "touch screen" which is inherently intuitive.)

In fairness there have been times when I wished my iMac would have a touch screen as well as mouse controls. Not at the expense of performance - or learning a whole new whiz-bang interface, but for underlining words, smoothing colors in a photo, or other things I find a mouse a bit too clunky. And I think "signature" on documents might take a step up from the current "/signed/" that's in use, and (I presume) in no way legally enforceable.