a) really, why is that? They are light, work well, and are fairly "aero" because there is almost nothing there to provide wind resistance
b) I could probably take those off as I don't really ride at night, but I'm sort of lazy.
c) while cleaning the chain, it moved around a bit on the rear and the chain came off the front. I just put it back on to keep cleaning, and left it there for the pics, but put it in a normal gear when I put the bike away for the night.