It isn't that we don't get it, it is that we don't see Apple going after niche solutions. People in the design community are at times oblivious to the fact that they are a small segment of Apples entire marketplace. For Apple to deliver touch on a desktop or laptop they would need to find a way to make the feature useful to a large portion of the user population. Right now most users don't need the feature.
We can argue all day about what percentage "most" is but to be worthwhile a feature like touch would need adoption by at least 50% of the users space. That would be adoption after the novelty wore off. I just don't see it happening with the current GUI nor do I see a good way to morph the current GUI into something user would want or even demand.
I'm reading a lot of things in this thread.
Good for children only, etc.
It all sounds very familiar, and goes back to the early 1980's, when they were saying the same things.
Oh, yes, of course, this is different, a mouse and keyboard really are useful. Yeah, yeah. Nothing new here.
Apple is making changes. How long it will take is something else.