We had the same issues with early HID upgrade kits so many years ago...
If the replacement bulb's light source isn't correctly aligned with the OEM halogen filament position, then the light output isn't correctly focused.
You get more (HID or LED) light output than Halogen, but it is somewhat scattered. So less of it reaches the ground ahead of you, and more of it goes astray to distract oncoming drivers.
Better quality bulbs (HID or LED) have better light source positioning for much better focus, giving you even more useable light while minimizing glare to oncoming drivers.
I completely agree with everything above. I'm an engineer and I don't really understand why some manufacturer out there can't solve this. It would seem to be a fairly simple problem.
Reminder: The following applies only to the Camhead series...
As I mentioned earlier, I tried the ADVMonster and Cyclops H4s and am currently running the Intel LED I linked to above. I found that the first two were simply WAAyyyyyy too bright to be acceptable. (I still, and likely now will always, have faint green spots in the center of my visual field thanks to all my damned fiddling with those Uber-bright LEDs.). I settled with the Intels because, of the three, they were the least bright. This sounds contra-intuitive but it's not.
LED bulb manufacturers seem to be caught in a "Lumen War." It makes no sense but that seems to be the thing. Go over and brouse Amazon. Ad after ad claiming 10,000, 12,000, 120,000(!) lumens. I think the one I linked to makes this ridiculous claim. It's stupid but I guess that kind of marketing drives sales.
LEDs have two advantages over halogens, they are brighter and they are whiter (or even bluish like HIDs). These two properties make them more visually striking and, it would seem, make the vehicle they are attached to stand out better. Their color is what matter to me as whiteness increases contrast at night and, to my eyes (what's left of them), make objects stand out better.
The issue about beam pattern is there and, from my back-to-back testing on my bike, is the same for all three brands I've mentioned. They all have pronounced scattering and poor projection to the right side (on US Camheads because the reflectors are asymmetrical) but since the Intels are not as bright, the glare doesn't seem to affect others drives as badly (at least not to the point where they start hate-flashing their high beams at me). I got flashed constantly with the other two brands but only once in many months of running the Intels.
To solve the right side issue, I bought a set of auxiliary lights and that seems to have completely solved my problems.
And so the search continues...
The minute someone offers a well engineered LED solution I will buy it but for now, spending $180-something dollars to blind other drivers just isn't a proper solution and is, frankly, short-sighted and selfish.