Absolutely and on top of that far lower pollution from tyre and brake dust, and less damaging to the road top surface.

The weight difference would make an unmeasurable difference in those things.

The weight savings for similar power output to current PMSM motors is roughly the weight of a passenger per motor. As others have pointed out the savings become cumulative and beget more savings in other vehicle systems. So yes the difference would indeed positively affect those things.