It is nice to see Uber listen to its consumers and make a move for its customer support right in the app itself, which saves you the trouble of actually sending an (perhaps angry sounding) email, not to mention having emails bounce between you and the support team as the team makes an attempt to fix things. Such a messaging-focused approach would go some way in shaving off the amount of time spent in communication, and Uber claims that test runs of this model have allowed its riders to obtain solutions within the first response. Sounds pretty efficient to us!
Right now, testing of such support is being carried out in select parts of the US (New York City included), and should things go right, it will replace email support worldwide in due time.