I agree with you on simplifying payment processing, but what exactly is financial privacy good for except tax evasion? Is there an epidemic of Visa/Mastercard/AMEX selling purchase histories to advertisers or something? Isn't that illegal?
The main payment processors operate a mafia of sorts - it's a closed shop - tx fees are fixed and determined by them. One aspect of bitcoin is that is allows the person sending a payment & the person processing that payment (the mining pools) to negotiate the price. The theory being that transactions with a better tx fee will be included in blocks quicker than those that don't.
By freeing up these aspects of the systems we use to send & receive payment - you allow other forces to come into play.
It helps protect the establishment and preserve the status quo. That's about it. It would be in most people's interest for these things to be public.