Something that hasn't been brought up yet; the actual regulation for lamp brightness was last revised more than a decade ago and it bases lamp brightness on the focal "hot spot" of the beam, which for single filament non-projector (that is, your average halogen bulb from 10-20 years ago) . The part that's directed straight ahead at knee height or maybe crotch height at worst for a (not lifted) truck and not really a problem for anybody sitting in the driver seat of a typical car.

Changes in technology and in trends for lighting have put projector housings, LED and xenon into headlights and they are less prone to a specific hot spot so the light directed everywhere forward is more uniform.
That seems like a good thing right? But it means that areas outside the central focal point are now getting more light than would have previously been allowable in a single filament reflector pattern if its peak hot spot brightness limit was compliant.

This probably means it's time for the DOT to update their regulation to cover modern lighting trends.