Correction: The headline figure is the motor’s maximum power rating. I tried an electric bike with a 350W hub motor, and on a moderate hill it did not have enough torque to move. Power = Work ÷ Time, Work = Force × Distance; 0 distance ⇒ 0 power.

I understand that mid-drive motors can deliver much more torque than hub motors. Maybe the OP is being realistic about what he needs in the Arizona hellscape where he lives.