Rad brand bikes with hydraulic brakes do not integrate the brake lever with the motor controller. Even on the ones you mention, that integrate the brake and motor controller, it’s still possible to come to a stop, release the brake lever, and then take off unintentionally into cross traffic because you were holding the throttle open the entire time. It’s a bad interface.

Total agreement on the other part but the injuries I’m hearing about have been kids riding their class-2 e-bikes into fixed objects, not crashing with cars.