CFR Section 91.319(d)(3) requires that each person operating an aircraft with an experimental certificate shall notify the control tower of the experimental nature of the aircraft when operating into or out of airports with operating control towers.

There was a time when every EAB was a one-off. Today a very high percentage of the EAB fleet isn't very experimental.

What is the origin and original intent of 91.319(d)(3)? It is an outdated rule?