Having used OS X on touchscreen displays extensively, we have found that when working in creative applications, it is very, very natural and often the most efficient way to interact with your work piece.
That said,
1, OSX on a touch display diminishes in usefulness as the size of display reduces. Wacom 27" (or iMac 27") good, 24 and 21" pretty good, 13" portable waste of time.
2, upright touch displays are not ergonomic to operate for long. Horizontal to about 25 deg, such as a wacom cintiq (or apples recliner iMac) good, laptops waste of time. You don't draw on a wall, you draw on a desk with a slight incline.
3, touch is only useful because your other hand is holding the precision input device, such as the stylus (or Apple Pencil), and as you draw or brush or model or edit, your passive hand is maneuvering the workpiece, instead of using your dominant hand to both draw or edit AND fumbling around (and comparatively, it is) operating the various applications inconsistent view commands with a remote cursor and a typewriter. The old way is a kludgey mess and always has been. Not inspiring that Schillers team can't comprehend what everyone in graphics and design has known for decades.
If Apple were to make a notable leap in their product lines functionality, it wouldn't be adding a touch strip to the bloody keyboard, it would be building the reclining touchscreen iMac they patented in 2010, with an active digitizer and Apple Pencil. That's the configuration that provides the biggest leap forward, and is easily the most efficient and natural feeling of all Mac configurations to work in.
However, for them to do it, they'd have to actually feel a need to spend some money on innovation for the apparently tiny percentage of their user base that uses their Mac for more than text editing.. As long as they're content raking in cash while coasting, we'll still have the option to pay $6000 for our Wacom-eqipped touchscreen Mac Pros & Imacs. Or just bite the awful bullet and get a surface.