Agree with what you are saying. As you noted however, power sessions generate much less muscular fatigue but at the same time you are moving additional volume and perhaps can fit more workouts in a fixed period of time and total if we are saying that total volume is the significant factor in hypertrophy, then it can be viewed as superior.Ive previously agreed that overall volume-frequency (weekly) are crucial variables here, so to some extent I agree with you.
But if we keep variables minimised, the reason I think 10 rep sets are superior to say 3 or 5 is that they tend to strike the perfect balance between tension/load and fatigue; lower and higher rep sets tend to overemphasise one at the expense of the other.
This, of course, assumes that hypertrophy is best stimulated through appropriately balancing tension-fatigue.
In short, I dont think that low rep training is as effective at generating adequate levels of acute fatigue even given higher volume. I mean, youd likely have to go to extremes.
Do you have any thoughts or experience on whether increasing say a 3 rep max on a lift transitions into additional reps/or weight being moved when undertaking hypertrophy work?