In a light aircraft the 1.3Vs is all that is required, far too much is made of approach speed by those who want to make themselfs feel important by turning flying into a black art.
I believe airbus uses something called 'groundspeed mini' which is an increase in airspeed to maintain a groundspeed that would be equal to 1.3 VS should your headwind suddenly not be there, leaving you out of height,speed,control and ideas all at the same time.
While I agree the effects of inertia are far less on a light aircraft, why should you not safeguard yourself against such an event by a moderate increase in airspeed?