If we count tablets as mobile too (they're wireless after all and plenty of them come with SIM slots) then the consumption part gets a bit better, in landscape mode you can read PDFs on them but the part of work that requires significant input would - for me - not be an option.

Some days, I'd totally agree with you; I'm not really sure of the next step(s), and have to give myself lots of time to think about things. This tends to apply when I'm entering unknown territory, and my tasks are relatively fuzzy and uncertain.

On the other hand, some tasks are extremely straight-forward (repetitive / memory-based), and more or less completely WPM and flow-bound. Even working with relatively efficient editors (using shortcuts, macros, VI bindings, etc), it's hard to type out (or otherwise input) much more than 2000 lines of code in a day. These types of tasks certainly require efficient input, and could be greatly enhanced by even better human-to-machine interfaces.

(I'm also a programmer, and these do come from my own experiences)

A lot of modern languages/platforms are able to be used as a REPL console. Same with commandline tools.

Being able to rapidly experiment with bits of code to identify the correct solution can be incredibly valuable.

I don't care if it's a bottle neck. I want an efficient means of typing, so that I can keep my focus on other stuff. Maybe I could do a lot of my typing using a terrible interface like my phone, but it would be very aggravating.