Yup, it's that simple - just allows you to fly when it gets dark.
As it happens, the lack of obligatory attached IMC training means that it's potentially very dangerous should you be over the mountains or sea (no ground lights) on an overcast (no stars) night - possibly achieving a full IMC effect whilst legally VMC.
I have a friend who uses exactly this situation to legally teach IMC actual flying in VMC only aircraft. Over the prairie in Canada...