TSandM:I doubt that anybody WANTS to be awkward or unstable in the water. My guess is that the divers in that video have at some point wished they could stop and look at something, instead of having to swim circles around it (at least I did, when I was new).
I completely agree, but the problem with giving them the skills to not be awkward or unstable is the outlook that "vacation divers don't need that level to look at the pretty fishes."
The skills are pretty easy to learn and virtually any motivated, able bodied person and many with disabilities can learn these skills. Some may need to work more than others, but if I can learn them so can just about anyone else.
It seems to me that some instructors seem to think this is hard to learn or hard to teach. It isn't. Maybe they think some divers enjoy struggling while looking at the pretty fishes or they don't deserve to have good skills right out of the block. I had to put in hundreds of dives to develop my skills, why should new divers get a short cut? I had to pay my dues, they should pay theirs. What's wrong with making life easier on new divers?