Using the "Antenna Tracker" module in MAVProxy

OK, The Pixhawk is capable of operating as an Antenna Tracker on its own, and the description of the “Antenna Tracker” MAVProxy module it says it is an “improved antenna tracker”. Am I right in assuming that the Pixhawk is still needed to obtain the pitch and yaw direction and drive the servos, if so, is there any benefit to the MAVProxy module "Antenna Tracker?