RE: Bent Arm??
It wasn' t that long ago that the ' standard' compound form was straight armed, high wrist. Of course, most of us shot easy pulling round wheels and bows with 9-10" brace heights, or more. The bent arm came along with the low brace, high intensity speed bows and light arrows. You can' t shoot a bow with a 5 1/2" brace and 5 grains per pound arrows with a straight arm or you' ll get eaten alive. I' ve even seen guys shooting with their elbows cocked up nearly 45 degrees!
I just shake my head and go about my business.
I still like a straight but relaxed arm, a bow with no less than 8" brace height and arrows not much lighter than 8 grains per pound. As long as the arrow hits where I aim it, I don' t care one whit if it takes a couple thousandths of a second longer to get there than someone else' s does.