Chopjock - you must understand that these profiles are, if flown exactly, guaranteed to permit a safe reject back to the helipad or a safe transition into forward flight and climb to 1000 ft providing the weight and temperature limits are adhered to.
They have been proven in flight testing whereas your pull pitch and pop out vertically has not.
The argument about exposure time is valid to a degree but with higher collective pitch comes more rapid and greater Nr decay in the event of an engine failure.
The profiles are actually quite gentle due, as Nick has explained, to the need to keep the power available and the power required quite close; your vertical departure will use more torque and therefore put more stress on the airframe and TR than the up and back version.