Sounds like the low beams are mis-aimed if they are generating a much larger light pool and likely dazzling other drivers on the road at night.
I am pretty sure IIHS is setting up lights according to the DOT regulations when they test. As the report says: "The low beams never exceeded glare limits".
It's simple geometry - headlights at the same angle will intersect with the ground farther when they are higher off the ground.
But does that have any noticeable impact on the driving experience - can't say I've ever noticed any difference in headlight lighting between SUVs and "normal" cars?
This is without getting into the actual instances of hatchbacks and SUVs on the market. There is more choice and variety in SUVs.
1. https://www.iihs.org/ratings/vehicle/toyota/prius-4-door-hat...
2. https://www.iihs.org/ratings/vehicle/toyota/rav4-4-door-suv/...