Why Motor rated in kW instead of kVA?

As we know the transformer is rated in KVA because its PF (Power Factor) depends on the nature of the loads. However, Motor has a fixed power factor, i.e. motor has defined power factor (P.F) and the rating has been mentioned in kW or HP on Motor. In more clear words, Motor only consumes active power and provides mechanical power in HP or kW at the motor shaft and that is the reason for motor ratting in watts.