Modern gas car engines are already pretty much inaudible over tire noise at slowish speeds. Electric cars don't make any less tire noise. People will manage without artificially adding sounds to electric vehicles.
Car sounds are important for small children and animals in the street though.
That's why many/most EVs have loudspeakers which make "electric car noises" below 20-30kmph. Above that the tire noise becomes dominant and there is no noise level difference between EV and ICE.
And as I've stated at those speeds tire noise is dominating the overal sound for most cars already.
At speeds below tire noise, drivers should be very careful about those anyway. Plus modern cars have collision detection hard- and software too. Do electric cars have better braking performance?