Even though it wasn't intended to. 'cause this rule was to avoid using the same subject for three sentences in a row. Especially if it was "I" -- which I suspect generalizes to the POV character regardless of the POV you use.
It definitely does warn you, however, that you are talking too much about the person seeing (smelling, hearing) things if you use the subject too much.
It also helps warn against big chunks of description, which also tend to the same subject -- the thing described -- and big chunks of having a single character do all the actions when there are more characters about, or even just without anything happening in the setting.
It has its uses.