Re: What I want from NFC phone payments
This is exactly the same as for every single payment in history ever, so I don't see why you're making out as if it's a negative. Obviously it's up to you to view the amount on the cash register display whether you're paying via cash, card, cheque, Apple Pay, whatever.
The whole point is to just pay in a near-instant, so you're not going to be able to have your phone display the amount on it at the time of "bonking" because by then it's too late, you've paid.