Most people use Uber almost entirely in a single city. This is obviously not true for those who travel a lot, but for most people they only need a single app (whether or not it be Uber) for their home city.
The real advantage Uber has is brand trust when taxis go back to their shady and anti-competitive business practices and the regulatory environment relaxes. The important question is if brand trust will be worth anything.
But does Uber really have a competitive advantage here? In the multiple cities I have lived in in the past couple years (Boston, Austin, Dallas) I have never noticed Uber's range being greater than any particular taxi. I do prefer uber do to brand trust, but I had no issue switching to RideAustin after uber left the city.
So the people I know that use Uber in multiple cities (mostly for work), spanning multiple employers and multiple countries and locations is a 'filter bubble' - but the inverse perception from you is common sense?
I'd say it is bad form to base an argument like this as fact, when there is clearly significant evidence of the inverse. We know that Uber has targeted airport usage, with a seemingly offline cache of airport GPS locations baked into the app - to tap the travel market... I'd be hesitant to say this doesn't alone make an impact.
The real advantage Uber has is brand trust when taxis go back to their shady and anti-competitive business practices and the regulatory environment relaxes. The important question is if brand trust will be worth anything.