I don't think anybody is "forgetting" about the trackpad and multi-touch, etc..
There is just sometimes no substitute for directly touching and interacting with content.
That's the whole compelling pitch for Apple's very own iPads.
My experience is that there are many people I've come across in life and on this board that push the same argument: give the Mac multi-touch. My response is that it already has it via the trackpad. Then the next reply is, give it a multi-touch screen! The question then becomes why.
The Mac already has pretty much all of the multi-touch functionality that iOS and the iPad/iPhone have. It's just done via a trackpad, which is much faster than raising heavy arms to touch the screen (e.g., pinch to zoom, scroll, etc.). In other words, in order for a Mac to have a multi-touch screen, it needs a reason to exist... it needs to be better and more functional that what already exists, and it doesn't meet that threshold.
Further to this, the entire OS (X) isn't designed for direct touch as the hit targets (user interface elements) are geared toward a pointing device that is accurate to the level of 1 precise pixel. This has significant benefits for productivity and professional work, and something that materially and significantly separates this platform from iOS and the iPhone and iPad.
iOS and the devices it rests on are designed for meaty finger input and voice.
The entire design logic and pattern... the medium of each (Mac vs iOS/devices) and the outcomes that are possible are different as a consequence of each platforms differing foundations.
So I'm neither looking for or expecting or wanting Apple to do a meld of iOS and OS X in the way people propose. The Surface Pro is a lawnmower with wings, and the Surface Book is a lawnmower with bigger wings. They're not great tablets and they're not great laptops either. Need focused devices, and Apple does that well.
The only problem is they've slipped regarding the fundamentals: the keyboard on this damn 2017 MB Pro sucks so bad I hate it, and the trackpad is stupidly too big. And the Touchbar is like insult to injury.