Brent .

I think is happens when anybody specialises too much on only one aspect of the style/system.
May it be effectivnes, Health, spirtual development.

I know it is not easy to fall into the same trap.

For me only specialising onto one aspect is the thing that waters down the Arts.
i.e. Stupid things like "Martial Arts are only for fighting" or "Look at the old Masters how much they fought, etc."

For me those People look at one Tree in the Forest and start to idolise that one Tree.
They also start to judge all the trees by the one they think is the best.

Funny thing is that they normally talk about one or two out of how many practicioners during the existence of a style?

Just my Opinion naturally.