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.....Why no touch screen ?
Tim and Phil et al have already addressed that several times in the past. The Mac and iOS devices are distinct categories that serve different purposes, and convergence is not planned in the foreseeable future.
 
They make touch screen all in one desktops too.

Oh yes I know. Many of our clients absolutely insist on touchscreens so we install touchscreens (this is for Windows).

Then later when we do customer site visits, literally nobody is touching the screens, ever. It all sounds great in theory, but for desktop users lifting your arms up and away from the keyboard and mouse is slow and tiring.
 
A touch screen on a laptop makes no sense. For one, merging a touch-based os and a mouse-based os is always going to result in a compromised experience. Secondly, the ergonomics of sticking your arm out to touch the screen aren't great. Your arm gets fatigued, the screen wobbles, your hand blocks the screen, etc. The touch bar makes way more sense, and I think it will prove itself a much more useful tool than a touchscreen laptop.
 
For the money. Should be included. Who cares if u use it or not. Just nice to have if you wanted it.
 
Replacing the trackpad with a giant touch screen will probably happen at some point, that'd actually be useful.
Not if the UI isn't designed for a finger, and Apple already has one dedicated to the hardware built with a touchscreen.
 
For the money. Should be included. Who cares if u use it or not. Just nice to have if you wanted it.

Facepalm.

I'm positive that there are plenty of manufacturers (and even plain corner shops) that will rig whatever you want "for the money". Go wild!

(Even, why stop at "whatever you want"? Take their suggestions too, and go double-wild!)
 
Well, touchscreen laptops / 2-in-1s really come alive when combined with the active pen digitizer. If you're interested you can check out the few studies available comparing test subject comprehension and recall among note-takers using typing on a keyboard and handwriting, respectively. Handwriting trumps typing for recall and comprehension, which isn't a real surprise to me.
 
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