The first car I had with automatic transmission was a brand new 1969 Vauxhall Victor (FD) 2000. I very quickly learned that the best way to control this car was to use a left-foot braking technique, especially when manoeuvring in restricted spaces. I am now in my 70s and still adopt this braking method in my current Vauxhall automatic (a 1.8 Astra) and I totally endorse your recommendation that drivers of automatic cars should use left-foot braking. Incidentally, as well as my automatic I also drive a car with a manual gear box, and I have no difficulty in reverting to right-foot braking when in that car.