Not waiting, the hallmark of unicorns for an impatient user base. Uber saved your life because otherwise you would have grown impatient, driven drunk, and killed a bunch of people? That's one hell of a pitch slide.
This is what I mean when I say it's hard to imagine that someone who gets out of their house could argue with the value that Uber creates. If you can't see the difference between the uncertainty and wait times you get with a traditional cab company and Uber, you must never have had reason to use it. It's like reading one of those complaints about bicycles scaring horses from turn-of-the-twentieth-century newspapers.