So? What's your point?
I wouldn't turn it off even on an clear gin day but I've seen guys do it, perfectly understandable.
I've seen CB's grow with absolutely no return on the wx radar at all but absolutely massive in size. Still no answer to why they turned it off....
Everyone knows how difficult it is to spot a CB (or Embedded CB for that matter) at night with no moon and low cloud so it's pitch black