Most, if not all more "advanced" lifters take a deload, or some kind of break, to allow the body/system to regroup from heavier more intense grinding, lower or heavy singles work etc.
Afterwards, starting up again with a certain lowered percentage of their already attainable maxes.
Depending on one's level of experience, jumping right back in can have one stalling or getting stale, then blaming the routine or looking for something that will work again. In truth, the body grows and adapts in chunks and spurts, not really linear.