Your citation blames the size of vehicles for the increase in danger, not A pillars specifically. And the demonstration was how many children could be sitting in front of a pickup truck before the driver could see them.

> “They are larger, heavier and higher up from the road than smaller cars and create blind spots that make it challenging for drivers to see vulnerable road users like pedestrians and cyclists,”

I drive a car with enormous A pillars (coupe version of a convertible) and never have issues seeing the children playing in the street because of it. Likely because most 8 year olds would be at eye level with me.

A modern F150 however, an entire car could be obscured by the long, high hood of those.