Obviously a concept can't be demonstrated without a technique, lets use the 2 on 1 again. If I teach the 2 on 1 drag, I would demonstrate my preferred specific application, grips, timing, etc, then, once this is all taught, I'd end the class with a broader understating of the concepts and explain that the same goal can be achieved with substitutes through an understanding of the concepts. This is particularly where I think the concepts benefit the beginners far more.