Here in Salt Lake I have never been asked for a tip.

In general though, I've found Uber experiences to vary significantly by region. In Salt Lake, I usually sit in the front seat, drivers are chatty, and the whole thing feels like "someone giving you a ride". In NYC, by contrast, I mostly sit in the back (a lot of the time the driver will block off the front passenger seat), drivers don't tend to talk, and the whole thing feels like a cab ride.

In fact, I would guess that many Uber drivers in NYC are/were taxi drivers.