I've had 2 situations where the Knowledge of black cab drivers has been hopelessly outclassed by the smarts of smartphone sat-nav.
The cab drivers sat in traffic, the Uber drivers were alerted and rerouted. I arrived on time and with a smaller bill. Sure a black cab driver could have done that with smartphone alerts but none of them seem to make use of them - perhaps it's due to professional pride derived from passing the famously difficult "Knowledge" exams.
Finally, black cabs are horrible if you're a cyclist, whereas Uber drivers are by-and-large no different from any other driver.
I'm glad the Uber drivers have better employment status now but aside from the horrible misfortune of having bought a hackney license, I don't really have too much sympathy for Black Cab drivers.