Pilot must have the ability to fly approaches with manual thrust and no FD. It is to develop a scan pattern with hands doing the required changes to thrust or flight path. In Airbus this training is imparted in Jet orientation or Entry Level Traning as Airbus calls it.Some rapidly expending airlines may not encourage it on line but they should allow it at least selectively with experienced crew. Otherwise the skill will degrade and a simple visual approach even with auto throttle can end up in a disaster like SFO.