Destroying the mental health of everyone around, especially local residents by non-stop multifold beeping is counter productive, especially as it takes only a short time for people learning the space electro sounds being deadly EVs approaching, that sound is of course also just as directional. If that were confusing (which I find that it is not and we do have already plenty of exposure with EVs here in Austria) one can standardise the sound but at no point does it have to be harsh beeping as if the whole city were one big non-stop construction site. It is not about the loudness, it is about the very feature you demand, that constant abruptness all the traffic noise pollution. That is mentally much more tiring than the existing sounds for EVs.