Steve Jobs hated arrow keys, and keyboards in general. If he could have got people to enter text with the mouse, and not ship keyboards, he would have. The iPhone, finally, had no keyboard.

He would have detested the bunch of cameras on the backside.

Hackers, however, love keyboards.

Makes you wonder why he is praised so much in our circles.

The term "reality distortion field" was invented just for him.

I don't get it. Why not use an upright T?

Per TFA, the most common pairs were: L,D U,R D,R U,D

An upright T only puts 2 of those adjacent, an inverted T puts 3 of those adjacent.

So, you place L,D,R on the top, and U on the bottom row.

Having top and bottom reversed is no problem because it happens all the time with scroll wheels (some platforms have the direction inverted wrt other platforms).

I imagine because an inverse T increases locality between left, right, and down. Three fingers can rest in unison. When navigating spreadsheets, documents, and user interfaces, down is the implicit “forward” direction and up is the exception.