I have no idea if it's the same type of reason, but it is also the same rule for cars as well. It is illegal to have running lights under the car or any other types of lights on the car while underway.
As for the anchor lights, I'm assuming that you are speaking of a white light in the middle of the stern. I have seen those on other boats. In fact some boats I've seen then are manufacturer installed so the white light can be seen 360.
I would think that its kind of the same as fog lights.
That's just my opinion though on it.
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