Agree with Wild Wille, for the most part. Top BB'ers & Pro's may be shown going to complete failure but seldom do in real time personal workouts. That eye's & veins popping out, grunting, etc is showtime stuff for the camera's. Also, anything you read that passes as training advice from any Pro, you might want to be cautious of. Most are selling something number one. Themselves or some book, DVD, product, supplement, etc. Who would really care what Arnold, Sergio or any other known BB'er said 40 years ago. Mostly BS anyway.
The important thing is the pump for true BB'ing and the best pumps are through higher volume workouts (old BB'ing saying, "more blood, more muscle"). If going to true complete failure on a first few sets, the rest of the planned volume sets can never be achieved the way they should. Burn out too fast to do justice to the remaining workout. Tend to stop one or two reps short on complete failure. Remember there are three main divisions of failure; momentary, complete and negative. Super shoot-up drugs or not, too much reaching failure taxes the recovery and CNS big time. Sooner or later you will hit the wall. Maybe why some old Pro's switched back to how they trained before the failure thing.
That famous shot of Sergio is in DeLand, Fla. Posed on the original prototype pullover machine. The improved version had a overhead pulldown devise attached. Best lat builder even, when not abused. As too many BB'ers did. Jone shoulder press machine was also very impressive, with the results gotten.. Both took the weak linked arms out of the exercise, for the most part. A few gym's had only Nautilus machines to training on. Good Luck.