This is what the current airbus FCTM says on the subject of rotation..
Rotation is conventional. During the takeoff roll and the rotation, the pilot flying scans rapidly the outside references and the PFD. Until airborne, or at least until visual cues are lost, this scanning depends on visibility conditions (the better the visibility, the higher the priority given to outside references). Once airborne, the PF must then controls the pitch attitude on the PFD using FD bars in SRS mode which is then valid.
And an old Boeing 737NG FCT .. these a/c lift off at between 8-10 degrees as well...
After liftoff use the flight director as the primary pitch reference cross checking indicated airspeed and other flight instruments.
I am quite clear in my own mind that the PFD is the pitch reference to be used after lift-off... i.e. after 8-10 pitch, or earlier if necessary due to weather conditions.
Any questions?