Yes, because the average American has a ton of disposable income available to spend on lessons. Oh, wait...

The "take public transit more" argument really irks me. Non-Americans often don't have a good grasp on how big the US really is and how far apart things are. In more places that not, reliable, efficient, convenient public transportation just doesn't exist. In still others, public transportation doesn't exist at all. I live in a semi-major American city and it would take me 2 hours to get to work on the bus. In a car? 15 minutes. Why in worldwide hell would I take the bus? I'd lose half my day. It's not that we see a driver's license as a fundamental right, but there are millions of people for whom it's essential to daily life because there are no other viable options

Who are you talking to about American driving tests? Everyone here has to take a road test to get a license. Some slip through the cracks, but it's not a formality. People fail all the time.

I think roundabout scenarios should be included in driver's ed material (if they aren't already, I took driver's ed 10 years ago), however since many places still don't have them, practicing is an issue. I live in a smaller but still major American city, and we only have 3 or 4. Kids who take driver's ed in the suburbs don't get any exposure. I think I just instinctively understood how to navigate one. My mother (a competent and intelligent driver) hates them. People who have been driving for 40 or 50 years may not understand them, but as they become the norm, new generations of drivers who will have grown up with them will obviously be more adept.