Airbus design philosophy is different it requires use of different sensory organs. Since Thrust levers provide no info about the present thrust it is pointless to keep a hand there. It requires a glance now and then on the N1 needle and the fan opening to confirm increase/decrease in thrust taking place. As long as the hand dealing with the side stick is resting on the hand rest it is good enough unless on the takeoff run. Because flight path stability rarely requires instant inputs. Sometimes habits from other aircraft are carried over to keep oneself in the comfort zone but serve no useful purpose.