What's all the obsession with putting cars into park while stopped at the lights for a few seconds ? Are we worried we might fall asleep at the wheel and release the brake pedal ?
Unlike an ICE auto where there is a reason to put the car in neutral or park at a traffic light (just pressing the brake pedal leaves the near-stalled torque converter loading the engine wasting a small amount of fuel) there is no such reason in an EV - if you press the brake pedal in drive while stationary in an EV the electronic "creep" is automatically disabled, so no power is wasted having the motor tugging at the foot brake.
So dropping into Neutral with the foot brake on makes no difference to staying in drive, but does increase your reaction time to get moving when the lights change. And being in park and/or applying the hand brake of course increases your reaction time to get moving significantly.
The only issue I can see in an EV with simply pressing the brake pedal in drive at a traffic light is literally if you fell asleep or your foot slipped off the pedal you would start to slowly creep forward. (And only in an EV which has creep in the first place) How often does that happen ?
Putting any automatic car (EV's included) in park without having the foot or handbrake also applied for the duration is also bad for the parking pawl mechanism in the gearbox as if the car rolls slightly it will put a lot of strain on it - don't do it. The parking brake in an automatic gearbox is only there as an emergency second line of defence if the primary means of braking (foot brake and handbrake) fail to hold the car stationary. It's not designed to be the primary means of holding the car stationary when stopped, especially on an incline.