This of course is all true. You have to be able to actually do the other things right too.
I'm sure Bruce Forsyth would engage the participants but could he do the rest of the stuff right. :)
What I mean is, you could have the greatest technique in the world (although this tends to be in the eye of the beholder), you can know your choreo inside out, you can say the right things at the right time and you can do the connection stuff too. And you can get people who are 10/10 for this sort of thing and become trainers and assessors. But if you don't have 'Fitness Magic' as they twee-ly call it, I don't think you can become a great instructor. And I don't think that can be taught.
I think the other elements can be taught though (with the exception of learning choreo).
And I don't think what LM can class as being a great instructor is exactly the same as what participants do, and I say that on the basis of some of the wooden trainers I've seen at quarterly workshops (and indeed from the DVDs) - one of whom I know from my former life as purely a participant who was often greeted in class with murmers of 'Oh God, not him/her' (i've deliberatly left that without revealing the gender).
Anyway, I agree with what you're saying in the main, and don't worry, I don't take anything you said personally. It's all in the spirit of debate.