Vastly overstating its capabilities? SF is ~crawling~ with them 24/7 and I've yet to meet someone who's had a bad experience in one of them. They operate more than well enough to replace rideshare drivers, and they have been.
SF has pretty much the best weather there is to drive in. Try putting them on Minnesota winter roads, or muddy roads in Kansas for example.
But SF is a single US city built on a grid. Try London or Manila.