'My' Airbus FCTM states: 'The flight crew must have their feet in a position so that full rudder deflection combined with full braking, even differential, can be applied instinctively and without delay'
Indeed, the airbus rudder pedals are designed to position your feet on the pedals, applying rudder with the heels and the toes ready to brake. That's what I've been taught as soon as I transitioned from the 737 to the 320.
One should indeed ask how else you can be ready to brake if something happens at or just after touchdown? Something like a burst tire, locked brake, nose wheel fault (off center). All unlikely events, but if it should happen, having your feet on the pedals, ready to brake (differentially) might be the difference between a non-event or making the world headlines.