I hate to say it, but I really do think that people can be very different in how they react to different approaches. We can even see it when we look at the routines used by some of the top bodybuilders; some use volume combined with reps of 10+ in every set, and some use lower reps. They've all figured out over time what works best for them.
As for volume, I think it depends how long someone has been training. The volume I use would destroy a beginner, but there are guys who use volume that would destroy me. I do think that volume is a great way to continue to push yourself farther once you can't keep adding weight to the bar. I believe that this is on place where bodybuilders and powerlifters MAY split off (of course, this isn't always the case). When a powerlifter hits a plateu they have to work through as well as finding new techniques to keep moving more weights. A bodybuilder doesn't care about the weights, so he can continue to stimulate new growth through adding volume.
Bodyweight- 231, currently cutting to under 220
Raw total- 1280
Equipped total- 1490
Best gym lifts, single ply-
Only goal- ELITE as soon as humanly (and chemically) possible.