Traditional Martial Arts: the base of everything

The more I hear from people who have only trained in the Reality Based Self Defence Systems, the more I realise that you need a background in or understanding of the traditional martial arts disciplines to be able to teach such a system.
There are principles such as “position then technique” and the employment of Leverage that you cannot forget just because you don’t wear a Gi and you’ve been taught that it’s all about punching somebody repeatedly to the head, close-in, with bare knuckles.