I definitely chose my friends right. One of my buddies just gave me his motorcycle because he never rides it and knows how much I love to ride. It's a beat up 98 ZX6R but I don't care, I'm just lucky that I have some amazing friends.
flip-down sun visor all day long, it has another benefit other than optical - you can run it as a partial shield and get tons more airflow on a warm day, a full shield no matter its darkening properties doesn't allow this without exposing your eyes to injury.
I thought Prime Day was kind of a bust out... looked more like clearance day to unload a bunch of off brand shit. YES, they had some deals on items.. BUT they promoted the hell out of this as a huge event!
If the intent is to reduce speed then it is is still more effective at night to have them marked than not having them marked. Under your example they would still be seeing them and slowing down twice rather than just running at speed and not slowing down at all.
Also it opens up either the city or the HOA (and whomever put them up) to liability for damage and injury, where as having them marked wouldn't. Anytime you create a situation where someone can sue you it's not efficient.