I have also seen a lot of new pilots rotate using the PFD! There is nothing new about flying, look outside. Hand-eye coordination will give you much better control of the situation near the ground than burying your head in the cockpit. I would also suspect that the Captain using the PFD to judge the flare is also being influenced by their peripheral vision which only comes from experience. There was an incident many years ago involving an Emirates A340 taking out some runway lights at JoBurg. The pilot had been "taught" a rotation technique during his endorsement which used the side stick position indicator on the PFD.