Touch screens work well and make a lot of sense when you can hold the screen (i.e. a tablet) in your hands (with arms on your legs sitting in a chair, on the edge of a table, etc) . Or, when it's propped up in a case/cover on a table at a shallow angle and your hands and arms are already in close proximity to the screen with your wrists on a table supporting your the weight of your hands. That's not fatiguing, your hands are supported, rather than being held up in air and under the effect of gravity.
A touch screen on a laptop, however, with the screen oriented at a slight off-vertical angle useful for typing with hands normally typing on the keyboard, then becomes fatiguing when you need to raise your hands to interface with the screen, but with nothing to support their weight. That's very fatiguing.
The Studio Surface addresses some of that, when it rests at a shallow angle on the table, with your arm/elbows on the table supporting your arm's/hand's weight while you draw. That works well when you want to do a lot of drawing. However, when you need to type, such as interacting with a web page, forum, writing a document, that shallow screen angle doesn't work well - and that's also fatiguing. The display needs to be flipped back up off-vertical.
What works for me is having the best of both worlds. A lightweight tablet and a lightweight laptop. I would not want a compromised and heavier underpowered hybrid.
As an aside, I'm astonished how so many people here do not have imagination being able to fathom or think outside the box a bit on how Apple's touch bar would be able to offer excellent utility when working in concert with applications. Beat me.
