Its not muscle failure. Its fatigue. Failure is not needed for fatigue to occur.
Your last statement makes absolutley no sense. Volume cannot be kept high no matter how intense your training gets.
Intensity is the %1RM you are lifting with. You can't say that you can lift more for 8 reps than you can for 2.
A deload is a reduction in volume at a constant or near constant intensity. If weight is an important factor in hypertrophy, why would you sacrifice it?
If intensity is important and lower rep ranges dissipate fatigue faster than higher reps, we obviously want to keep intensity since it is synonymous with low reps.
What's left to cut? Volume. SO we cut volume and leave intensity and this allows you to dissipate fatigue in the presence of resisitance training.
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