Comment by makeitdouble

It might be complicated.

It is indeed unregulated and often blinding. But there is also no one limited use case as it can be for car lights:

- these lights are sold internationally so they don't assume one specific country in the first place

- it's not just for road use, people will use them in rougher bike paths where there might be absolutely no other light.

- seeing the path forward isn't often enough. You don't have a windshield nor can assume a cleared path, so knowing what's at head level can also be crucial. Even on dedicated bike paths there will be branches and unmaintained/unexpected bits that need avoiding.

- being seen can be as important as seeing yourself, and often back lights are small and a pain to recharge. Many customers will want a wide spread front light that reflect all around, even if it mean charging it more often etc.

All in all, it might be that biking itself is wholly unregulated so lights will have a hard time being single purpose and regulated as well.