To pick one example: being able to flick through long documents with a finger while keeping focus on other parts of the screen alone has been a huge productivity booster, and I do not say that lightly.
Like I said before, I was firmly in the "touchscreens are a waste of time for me" camp until I actually started using my Surface. Not trying to sound like an ad, it just has been my actual experience.
Most of my "work" time I spend in terminal. White text on black background, keeping my fingers on home row. I cannot see scenario where touchscreen makes me more productive except in some edge cases, and btw they don't gain over what I already have now. But that's just me. Each to their own, that is only fair thing to say.
But making assumption and claim based on your own point of view is not best thing to do. With Apple, especially it is always the same story, customers leaving and rarely satisfied (it was period around Snow Leopard, IIRC 2009-2010), but still I can't find anything better than MacBook. Dell and Lenovo came close, but when I install Linux on them I make few more sacrifices, summing everything up, Apple just works for me. (I won't even mention Windows. 100% not my cup of tea)
They switched to Surfaces because they wanted power-user hardware?