That it is better to teach multiple options and not be locked into the idea that there is only one way to use a technique.
This can make it very hard for the teacher. They have to firmly understand the limits of a technique, or an arm or a leg for example. Marry this with "pushing" students and it can be very tough.
But there's been a couple of people now saying that they don't get taught any...
Surely it's better to teach one or two well and inform the students that it's not limited to those, and encourage experimentation?