And you'd have to try really hard to make anything much worse than stock.*
Sometimes it's tough to appreciate the work that goes into what highway engineers do. For example, just this week I was in (a Virginia, US) town at a left turn and complaining at how far back I was from the intersection. It's a protected left turn, but I still like to see what I'm turning onto. Yesterday I saw a large truck turning there (Tractor-and-trailer type). He pulled into the intersection, wheeled around, and finished his turn with feet to spare before he hit the cars in the recessed turn lane. Things that seem darn inconvenient are there for your safety.
Vehicular lighting is one such system. Generally they could be better, but are presently pretty darn good at what they do. Their required goals include:
1. Never dazzle a driver. But be bright enough to see all the time.
2. Never impair other drivers' vision under reasonable driving conditions.
3. Be visible in many directions while maintaining 1 and 2.
4. Durable and reliable for dozens (lamps) or hundreds (Other lamps) or thousands (Lamp housing) of hours while managing 3.
5. Consistent with all existing signal lights (More red = stop, Red & white in US means reverse, yellow blinking = signal) in tint, pattern, and spacing while managing 4.
Manufacturers often add more requirements, such as:
6. Low enough power draw for the vehicle in question.
7. Good airflow and appearance on vehicle.
8. Cheap to manufacture.
9. Reasonably easy to install/replace.
Highway engineers in most civilized countries have fairly strict rules about lighting systems to ensure compliance with all these. There is not yet a system that would account for time-of-day glare or wetness-of-road directional control to significantly improve signal performance cheaply. Until then, don't knock what works!