this is one of the core conceits behind why Strong Towns / Not Just Bikes / urbanism discourse in general makes the disctinction between a "street", which is meant for people to walk along, go to stores/restaurants/etc, and "roads", which are meant to efficiently move traffic from one part of the city to another.

Combining them degrades the ability to address either point: efficiently moving traffic is inherently in conflict with being able to access businesses or having pedestrians nearby.