I worry any owners will develop a pathological hatred of specks of dust.
Light leaves the bulb, reflects off some surface into your retina.
This doesn't reflect so you cant see it.
The more reflectors you add, the more you move away from the point of vantablack, and theres going to be the whole central area that doesn't have reflectors. If you're looking side on and can only see a reflector on the left, and reflector on the right, are you going to discern the car in the middle?
Black cars are already involved in more accidents [1]. This seems like it would be worse.
[1] https://www.telegraph.co.uk/motoring/news/7845366/Black-cars...
Even in rain you see people with no lights on. I think that lights should be on all the time like some Scandinavian countries do, or at least come on automatically when your wipers are on.