America has the downsides of being the first-mover and of being dominant. A lot of our system was built before modern computerization and then retrofitted for the bank's convenience (not the customer's), and because the U.S. economy & military is so dominant, the rest of the world has to deal with the U.S. financial system as it exists now. That means that there's very little pressure on existing U.S. retail financial institutions to improve, and a lot of regulations and institutional inertia keeping out new entrants.
It's much the same situation with Internet access (where our consumer Internet speeds are often 2 orders of magnitude slower than in much of the rest of the world) and in health care (where we spend the most but have one of the worst life expectancies of developed nations).