At the end of the day uber still sends pings to nearest driver to maximize service to pax, however ..... Oftentimes there will be several cars equidistant from pax. What then ? Uber choices include at least:
Send ping to-
1 highest uber commission
2 highest rated driver
3 newest driver (to addict them)
4 veteran driver that looks to be slowing down
5 driver that has done 5 short pool rides in traffic in a row, where pax destination is a long ride (to avoid pissed off frustrated driver who might otherwise quit)
6 driver with destination filter in use and route matches driver destination
7 driver on hourly guarantee, by sending this driver the ping uber maximizes its investment in that driver
.... Plus many more options......
No confirmation from uber that any of this happens, of course.....