It's not throttle response, it's torque at 0RPM.

When you're racing, you rev your engine before the light turns green and pop the clutch when it turns green.

You don't do that when you're not racing, because it's hard on clutches, and the vast majority of daily drivers are automatics.

When you're racing an electric car, you mash the accelerator when the light turns green, the same way you start the car moving when you're normally driving. So you get race-track start feeling every time you drive your car.