Perhaps non - Airbus pilots may not realise that with the A/P engaged then the side-stick is "locked" in position. It requires a breakout force to disengage the A/P, thus using the PTT switch is catered for. One of the best arguements (in my opinion) for keeping the hand on the S/S during flight critical regimes is to be able to use the non-intuitive side-stick take-over button. This is especially important for the P1 should he intend to intervene. Dual inputs have a nasty habit of spoiling one's day This is one area where the Airbus really does differ from other types and needs a self disciplined approach from crews new to the type.