This pretty much summarizes it. A quote from Josh Mohrer, Uber's New York City general manager. This is what he said when the tipping was released in 2016.
"Nothing has changed, as we've said for many years, being Uber means you don't need to tip. Of course, if you want to tip your driver—we estimate riders offer tips on only a very small number of trips—you’re free to do so, and drivers are free to accept."