If you can provide a reference from the your Airbus manual with a recommendation to look at the PFD during rotation and flare, all I can say is strange aircrafts, strange ideas! However, I doubt you can...?
Had an A320 FCTM in my files:
Takeoff:
Rotation is conventional. The PF must perform the rotation mainly head-up, using outside visual reference until airborne, or at least until visual cues are lost, depending on visibility conditions. The PF must then monitor the pitch attitude on the PFD.
Flare:
In order to assess the rate of descent in the flare, and the aircraft position relative to the ground, look well ahead of the aircraft.
