Hand on Thrust Levers not part of Airbus Philosophy
By making the design choice not to have the thrust levers backdriven during autothrottle operation, Airbus has declared that a hand on the thrust levers plays no role in monitoring their system. "Hand on the thrust levers" has been replaced for these airplanes by "eye on the engine instruments".
In general, the Airbus design approach renders all tactile feedback meaningless. As a result, it is more difficult for crew on an Airbus flight deck to keep themselves in the loop than on a flight deck where the throttle levers and the pitch/roll controller inputs are backdriven and coupled.