You are incorrect. Induction machines are often used as generators. My employer uses them almost exclusively in the generator configuration. The Lorentz force is symmetric; in the generator mode of operation the magnetizing flux vector leads the torque-producing current vector instead of lags, but the physics still works the same.
The induction torque speed curve is also very performant even when compared to PM machines so I don’t understand your criticism. Source: motor control engineer.
The induction torque speed curve is also very performant even when compared to PM machines so I don’t understand your criticism. Source: motor control engineer.