While many Harley folks do tend to think "style" is more important than function or safety, count me in the opposite camp. Rag on the Winger's all you want, but I'll bet they are much less likely to be run down from behind versus a SG (or any other bike with only one or two lights on the rear).
Maybe it's just me and my eyesight, but I find most LED brake lights to be less visible in daylight than the good ol' incandescents. That goes for automobiles as well as bikes. And there are real and valid reasons why that may be, including the cost involved in putting enough LED's in the light to actually equal the light output of the incandescent bulb and reflector.
Anyhow, IMHO you can never have enough lights on the azz end of a motorcycle. Maybe it has something to do with my being run down from behind about 25 years ago, stuff like that tends to stick in your head.
Jerry