The vaunted "knowledge" failed miserably as he pulled over to drop me off -- I looked up and saw we were just south of Tower Bridge. he clearly hadn't got a clue. I said "just take me to Southwark tube station". I know there's all sorts of one way systems but when he was heading to Bermondsey I just told him to let me out and got the tube (well tried to - Southwark was closed, so ended up at Waterloo and having to walk)
Uber just works because it's not based on a system from 1865.
As a passenger I feel it's a significant qualitative difference if I have a driver who knows his way around town compared to one who obviously and fixatedly relies on the GPS.
Had that in Washington DC once, but magically the machine fixed itself when I said I had no cash and he'd have to get the police.
A lot of drivers still use unapproved card devices, though (TFL points out handheld terminals are explicitly not approved, yet I regularly have taxi drivers insist their fixed terminal isn't working, and to use a handheld one), which I'm taking means there's assorted tax fraud going on.
Yes people laugh off drivers as a no skill job, but it's a craft. Shift work, passenger safety and so forth, they need to pass a test, sure that's a bit outdated in the time of online maps.
But I can not simply open a dentistry just because I feel so due to lifestyle choices.