Making the bezel more narrow would be a disaster. I already run into the occasional problem where one of my fingers is close enough to the screen on the side of the phone to cause a missed tap.

Unless they also at the same time managed to tweak the tap handling to deal with that situation better.

And before you say, yes I'm clearly holding it wrong

Also, I'm not sure if it is a fault with my phone or the new design of the digitiser, but the 5 seems somewhat less sensitive to the touch than previous devices. Need to go and play with some other 5s in store to compare (have been avoiding going into Apple stores since the retina MacBook was release, for obvious reasons).