Uber at least always shows you both Pool and X trip times and prices at the same time when ordering. This at least gives every X passenger the opportunity to consider a Pool trip first.
Despite having a dim view of Uber and Lyft generally, I've had good experiences in Pools. I find that they're a great way to get recommendations for bars/restaurants/events in the area, and you have either a source or destination in common. People are usually either friendly or silent.
Not only that, but Pool encourages better transport resource utilization.