Not so sure you needs to re-phrase.
-Yes, with accumulation the main stressor is volume and with intensification the main stressor is intensity. The primary reason given for alternating is to give the CNS a break and, to a lesser extent, maintain muscle mass.
-If working with younger athletes, a straight linear model can be used because the output is lower which means they don’t need to alternate. Also, because they’re young and neurologically inefficient they can get a strength training effect out of 8-10 reps.
-As an athlete matures, they can start to alternate but keep in mind something Charlie has said which is they first need to look the part. That tells you more time will be spent in accumulation or hypertrophy type training.
-As they progress through their careers, the average rep used ( Olympic lifts, Core lifts ) will drop which means more intensification type training. Also, they’ve become more efficient which means the 8-10 reps are now accumulation.