No matter who is to blame reflective elements on clothing increase visibility and safety. Of course nothing would help if a driver is distracted by a smartphone but this is another problem. As a pedestrian I wish I could wear only jackets with reflective stripes but in most cases there is no such option available.

Even when I cycle (which implies speed much lower than for a car) I sometimes notice pedestrians in dark garments (without reflective elements) at a small distance and have to brake hard (moving light beam up would help to see them further but it would blind both pedestrians and other drivers).