Heh. People feel rises in sales tax elsewhere too. When VAT rises merchants all raise their prices, they don't normally swallow it (or if they do, they make a big fuss over how awesome they are).

The US system is a complete pain in the ass. You never know how much money you actually need to pay for anything unless you happen to know the local rate and do the multiplication in your head. There's a reason this system is not used in big chunks of the world economy.

Expose information in a digestible way. Just because you don’t instinctively know how to implement a UI for varying sender fees doesn’t mean that other wallets don’t.

I would love to know how to do it. If you have an intuitive GUI in mind please show us so other wallet authors can copy it :)