I'm a former DC trainee. I grew like a fuckin' weed and was super strong... but I realized a few things....
1- Before I started DC, I did volume training. I would do the typical 16-20 sets per bodypart once every seven days each. I mixed up workouts, copied out of magazines, and did exercises blindly. I always trained hard, but never REALLY went to failure.
2- I would always get stronger getting ready for a show because I never focused hard on eating big and clean in the off-season. Pre-contest was the only time of year I was constantly fullfilling my nutritional needs.
3- I did the fun heavy exercises, but I did the bullshit "shaping exercises".
AFTER DC TRAINING, I REALIZED THE FOLLOWING...
1- I focused on going to complete failure, most exercises taken to literal failure.
2- I focused on basic exercises only. Understood that there is no "shaping exercise". The fastest hypertrophy came from getting progressively stronger on the exercises that broke down the most muscle fibers. If you squat 300lbs for 10 today, and you squat 500lbs for 10 in two years, your quads will be much larger. The logbook is the bible.
3- Progressively larger amounts of food or else you won't grow... period. The cleaner the calories, the better... but If you want to be a superheavyweight, you will at some point get a "little sloppy" because in order to be that huge, you need a massive surplus of protein and clean fats/carbs. If you junk it, you'll look like junk.
I think everybody has a different requirement for volume because genetics, diet, level of training intensity, are all relative to volume. A set program isn't necessary if the logbook keeps moving up.