noremap <Up> <nop>

noremap <Down> <nop>

noremap <Left> <nop>

noremap <Right> <nop>

Isn't that annoying in insert mode?

I'd recommend against navigating while in insert mode.

You shouldn't be navigating in insert mode. If you mess up a word it's easier to ctrl-w to delete the last word and retype it.

Just as a datapoint: I've been using vim for >12 years and I still use the arrow keys. Don't sweat the dogmas too much, try out what works best for you and stick with it.

I don't want to come across as a dick, but as another data point my boss has typed on keyboards for longer than I have been using computers and he still types with two fingers. Just because he is not crippling himself too much doesn't mean that he is getting anywhere near the same utility out of it that a touch typist would.

There's little correlation between finger count and utility.

I use only 4-5 fingers most of the time and go faster than most touch typists.

'noremap' has no effect on insert mode.

  :help noremap