Specifically, I'm concerned about bending with weak-and-inexperienced hands / fingers.
Logic tells me that it'd be easier to feel the string and not lose grip on it if the frets were higher (still low action in terms of fret <-> string gap), 'cause one wouldn't be feeling the fingerboard as well. I can imagine the string's slipping from under one's finger if the finger were in contact with both the string and fingerboard whilst pressing down and bending.
As for width, the only thing I can think of is that the target area for fretting would be wider the narrower the frets. Does this come into play, especially as one moves up the neck and the gaps get smaller?
Those are just my amateurish guesses at this. I created a thread over at Rig-Talk but wasn't able to get many responses; I'd love to hear what you guys think along with your reasoning... please!