That’s not true. You’re describing a rocket, not a turbofan or even a turbojet. Fundamentally, modern high bypass turbofans are just shrouded propellers. Could

That’s not true. You’re describing a rocket, not a turbofan or even a turbojet. Fundamentally, modern high bypass turbofans are just shrouded propellers. Could reach supersonic speeds in the same way using electric. Lift to drag is about half as good at low supersonic speeds as transonic, so cut your range in half, but fundamentally there’s no reason you can’t achieve supersonic electric flight. Just need good batteries to get that range...