Actually, the biggest problem is not having a point, or actually, a short horizontal “line” source of bright light in a headlight housing designed with the assumption that such a point or line is the source. If the emitting source, a filament in incandescent (often halogen) bulbs, is over approx. 1 mm “tall” and maybe 8 mm wide as oriented in the housing, the reflective surfaces spread the light around too much.
If you look at an aftermarket bulb, most have several LEDs spread over a much larger “footprint”, and now you have a lot of light bouncing off the “old design” reflective surface in unintended directions.
Of course, adjustable beam headlights are often simply out of alignment. That can obviously happen even with a standard incandescent / halogen beam headlight.
Multiple LEDs or “COB” LEDs (for good output) can be made to have a reasonably well defined pattern — for example, think of several focusable LED flashlights positioned in physical “parallel”. However, the reflective surfaces have to be designed for that purpose. Many new cars have such “new design” LED lights, often in very creative shapes - and then if one fails out of warranty you pay a small fortune for the replacement.
The other issue is color quality, as high color temperature light helps the driver behind the headlights “see better”, but it is highly irritating to most oncoming drivers.
When I replaced the entire headlight fixtures in our 2009 Outback, the replacements have an improved low beam pattern that cuts off more sharply the top of the low beam, with slightly more light “low”. This comes at the cost of a high beam pattern that is pretty wanky well off to the sides, say @ 80 degrees, but that’s not really much of a problem.
*Depends somewhat on the housing / reflective surfaces’ design.
LEDs throttle nicely when driven with a PWM source. (Pulse width modulation)