so instead of making the silent electric cars make some sort of noise for pedestrians to hear, they should all just carry a device susceptible to the EMI an EV generates to allow for proximity awareness of a silent EV approaching. /s

I know nothing about the technicalities of why this specific EMI is hard to eliminate, so I'm asking an honest question. Why? What makes it difficult to block this EMI? Where is it being generated (I'm assuming the motor windings??)? Is there not some sort of cage that can be built around the motors by lining the wheel wells to block the EMI?