I'd love to say they're all aimed badly, but I kinda doubt it just because of their prevalence.
A few years back my '97 F350's headlights were heavily yellow and sanded, and then finally leaked and filled with water so it was time to replace. I went with new clear housings + LED... so bright! I no longer tire when driving at night, because I can see so well.
I almost never get flashed, though. Maybe because it's a "big truck" but I doubt it; I think it's because I did a great job adjusting the lights. Mind you though, these headlights aren't LEDs through an almost-pinhole projector; these are the big reflectors just like came with the truck. I think this makes a lot of difference because the worst case face full of headlight you get is from a much larger area, less concentrated.
(The truck has a small "factory lift" from the original "off-road package", plus bigger tires for pumpkin clearance, so it rides higher than stock - as a result if I pull up behind a car at a stoplight, I know my lights are going right over their trunk and I turn off the headlamps, leaving parking lights on until they pull out. I can see this being a huge problem otherwise...)
I've definitely gone to the "stare at the white line" too. For whatever reason I grew up looking at headlights - probably because in my younger years I could ID potential cop cars from far off by their headlight shape, but that was still a bad habit to have. As it is now, I focus on driving on the white line whenever there's oncoming traffic, though being rural I hug the middle line to have a couple extra feet to avoid animals, so I'm bouncing around the lane depending on what's going on. I think it's a really good thing to get used to, being able to drive on the white line, regardless of a right or left turn or straight. So many head-on collisions could be avoided just by being a foot further away... and that goes double at night when some people shouldn't be driving, and visibility is worse.