Pretty interesting post.
Texture means something though. Even a 1:1 relationship means something, it tells you what something is, where to look for things, how to understand this interface in the same intuitive way you understand a physical object. To be angry about 1:1 (I totally see where he's coming from though) is equivalent to being angry about the physical world.
The metaphor to reality matters in a UI because the physical world has intuitive rules. When you can figure out how to accomplish computing tasks inside of those metaphors such as using pinch to zoom, then you've made something intuitive.
One thing you'll notice in Apple's newer gesture actions is that the user usually has control over the animation itself. So it's not just a symbol that results in an action, but control over the transformation of "space" on the screen, its completing the bio-feedback loop between your intent, your action or touch, and seeing the result of your intent. This makes it memorable, because this is how people learn in the most basic way. It's how we learn to walk, ride a bike, drive a car. We have an intent, we act, and we see and feel the result of that action as we do it. How many tries does it take to remember that turning the wheel of a bike too sharp causes you to fall? One, we learn that instantly. (I did that when I first rode a bike.)
We are built to understand this basic quality of the world, that it has dimension. Why should we hide from that in an ugly abstract space of contrived shapes and words?