I don't have an answer to the question of HST vs MS for hypertrophy. But I do know that Max-Stim has a sister method in Germany called PITT-Force. The wife of the PITT-Force founder became an IFBB pro in two years of weight training using PF all the way. The use of anabolics is of course up for speculation. I spent time thinking about it. In the words of Julius Caesar, people believe as they are inclined.
Tonight I tried MS for the first time. I ran into a lot of situations where racking and unracking the weight added to fatigue and eventually became unmanageable. This is simply the result of using equipment designed for typical concentric focused, multiple rep type training and is by no means attributable to Max-Stim. I have run into this problem before when using other unconventional systems. I will have to think through my exercise and equipment selection.
MS does have the HST principles in it. There are common truths underlying all effective systems. You and I cannot escape the mandates of human biology. Neither can exercise advice.
What is important to understand about Max-Stim is its premise that muscular fatigue does not cause big muscles. Tension, not fatigue (or "burn" or "pump"

, causes big muscles. This is why in Max-Stim you put the weight down after every rep. Doing so gives the muscle time to recover. As a result you can do more reps. More reps equals more tension. More tension equals more muscle growth. This is the essential theory behind Max-Stim and is what separates it from all other weight training systems, HST included. Whether or not this theory is correct and, if correct, can be manipulated to produce better gains is something I think we are all trying to figure out right now, Dan included.
Give it a try. That's how you learn.