It seems like the benefit of Uber was that it provided better service for many who didn't have the superior taxis in Newcastle.
If all the other replies (including some UK ones) in this thread contradicting your personal experience don't convince you, would that be a form of solipsism? (https://en.wikipedia.org/wiki/Solipsism)
Now instead of having this patchwork, we have one giant monolithic taxi provider (Uber) that threatens both the good and bad taxi services of old. And because Uber is more than happy to subsidize rides thanks to VC funding having an equal/superior experience is often not enough to compete.
And as far as I know you still can’t book an Uber for the next day or whatever.
At least here in Berlin, when I book via Uber, I'm told more often than not that it won't be an Uber picking me up but a normal taxi.