I find this needlessly strict. Personally I map arrow keys to more useful things in normal mode (tab switching for left/right), but I leave them in insert mode not because I have a bad habit of using them, but because on the occasions that I instinctively use them (eg. I often type pairs of braces and then back-arrow) they are not a crutch preventing me from using some more efficient normal mode ops. I am extremely fluent in hjklwWeEbBfFtT, and I correctly use the atomicity of insert mode, so it would just be dogma if I remapped arrow keys in insert mode.

Also btw, Control-h,j,k,l I have mapped to switch windows.