Whilst I agree that you don't need to rotate a light Aircraft in a lot of cases.
Seems that Piper don't agree with you----
Piper Warrior 3 Pilots operating handbook describes a flap 0 takeoff ( in describing a Flap 25 takeoff they use the same words )
0° FLAPS TAKEOFF PERFORMANCE
Flaps....................................................... ..........................................................UP
Accelerate to 40-52 KIAS (depending on weight)
Control Wheel ............................................................ ...........back pressure to rotate to climb attitude Accelerate to and maintain 44 to 57 KIAS (depending on weight) until obstacle clearance is achieved and climb out at 79 KIAS.
In the expanded section they say:--
Allow the airplane to accelerate to 45 to 55 KIAS depending on the weight of the aircraft and ease back on the control wheel to rotate to climb attitude.