How come cattle get big and thick without touching a weight? How come 1980's BBers who almost never squatted or deadlifted and used mainly machines with all kinds of exotic rep schemes looked fabulous? Take enough juice, get enough food, and even a shitty training stimulus is enough to progress. It becomes a question of optimality, how can you get the most gains? When you are already a very advanced lifter, how can you continue to make progress. The main issue is that when it comes to hypertrophy with absolutely no performance criteria, people who don't have to be tested and have no qualms about using copious dosages on a constant basis can just use more drugs and compensate for bad training. If you wonder why BBers know tons about anabolics and diet yet very little about training theory - this is the answer. It's also why you hear, "it's 95% diet" - for these people it is, but that's not to say that they couldn't get more out of a cycle at a constant dosage by using a better training program.