Riders were annoyed when they were contacted by their Driver to confirm the location. Riders expected Uber to do the work and didn't feel the need to reiterate.
Often, Drivers did not arrive where the Rider expected. Riders would need to cross the road, backtrack on the block or negotiate an alternative pickup location.
Riders behave in two distinct ways. Those who explicitly set a pickup location (via search or pin) and those that expected the Driver to arrive at their current location.