They do it because they get saftey ratings which are occupant based.

You want the absolutely brightest, longest shining lights possible to light up as much of the road as possible, but that has consequences for others.

Theyre probably bumping up against whatever high end limits are allowed before the saftey agencies cause a fuss.

But while it might solve one problem fixing this issue, it will probably cause another, e.g more people will be overdriving their lights.

oh, they could absolutely make LEDs in an acceptable manner. but they don't.

there's some more inherent difficulty with getting LEDs to be acceptable, as well. not to mention the way they're built nowadays means they're not easily replaceable.

however, your comment about aiming is completely incorrect. aiming is irrelevant, because roads have curves and elevation changes and bumps. lights need to not be so dangerously blinding even if pointed straight at somebody's face, because they will be pointed straight at somebody's face for many non-negligible occurrences. I know this because it happens to me every fucking night I'm outside around cars.