In fact, low speed electric cars are quiet enough that they've considered putting speakers in them to alert pedestrians and make the absence of feedback less disconcerting for drivers.
We're so used to ICE cars that they've contemplated making electric cars pretend that they have an ICE.
They already do this in Europe and other countries where mixed car/pedestrian environments are more common.
Electric cars must have some form of audible signature, usually a quiet whirring sound.