Hidden in plain(?) sight

But whose fault is it? 

What I mean here is an interesting phenomenon that occurs as a result of experience gap in a given filed, which in our case is martial arts and combative training. Specifically, with years or decades of training and practice certain things become kind of obvious, or at least they seem that way...to us. 

art by Karl Addison

However, the level of perception for the phenomena that make one's field of study can become quite high due to an equally high degree of kinesthetic perception, i.e. inner feel for the movement and general body behavior, stemming from countless hours of working on and with our bodies. And, after long period of such experience it is easy to forget how it all looked and felt in the beginning. 

If you are an instructor, you should not allow obviousness to become a part of your training plan. OK, if you are a coach who spends most of the time working with fighters and competitive athletes, who follow a continual training regime, the understanding of all the important things will indeed unfold over time. Yet, if you are working with who cannot or will not engage in that sort of work, for whatever reason, and particularly in a group format, it is important to regularly repeat even the most basic (and seemingly obvious) lessons/instructions. There are at least two strong reasons for this: one, there is always someone in the group who "doesn't get it", and subsequently may hinder others as a training partner; two, even for those who did get it (or think they did), such instruction may gain new/deeper meaning when reiterated over time.

This is especially case when you have in your class a person who shows the potential and/or desire to also be an instructor at some point. Namely, for them it is not just the process of learning the subject matter, but also learning how to present that material and helping others understand it. And if the art/system you happen teaching is important enough that you'd like to see it grow in the future - this is an important element of contributing to it.

Finally, regularly repeating even the mundanely "self-evident" axioms of your teaching will make you seek new ways of doing it, thus improving, expanding and deepening your own understanding of the material, not to mention the benefits for your teaching skill.

Obviously, it is a win-win proposition, so what's not to like?