Heck who am I to pass judgement? some silly git with less than 50 logged dives since I rediscovered diving .I've got like 70 dives and I can make micro-adjustments with breath control. Lots of people have a lot more experience than I do and can just do it without using their arms.
I don't see a reason to use my arms at all other than holding equipment, or maybe holding hands with an insta-buddy.
What? Is that wrong?
But what if it is a case of.-"cos thats the way its always been done" ?
What if it turns out that the fish,birds,airplanes and racecars/bikes have it right?
Isn't it then worth asking the question?