I keep writing wanting to answer a question you didn’t ask. “dudes”, amiright? So after starting over for the third time. hahahahaha. I hope my opinion here sort of addresses the actual question.
Anyway. I think there is an argument that there are some genotypes that would naturally prefer higher intensity work. But one can shift their phenotype. If you think of fitness as accretive you can imagine that a longstanding phenotype could create a sense of ‘the kind of work I’m good at’. But phenotype can be changed through consistent effort.
Even subtle differences in previous fitness regimes can shift your bodies ability to withstand and maintain particular efforts. When an ancillary skill/system is relatively weaker (so far as to possibly be a limiter) then the work itself can create an imbalance whose output feels like ‘non-optimal’ gains, or injury can ensue.
I’d say the general, “I respond to this better” idea is more based around their bodies natural reaction to that type of work based upon the existing physical system in place.
I’m going to take a wild swing and say, That is why these plans are as focused on progressive overload and even the internal text for form sprints, posture, etc.
I’d guess that if you follow the plan through, by the end, if you are consistent your body will be better able to withstand that type of effort. I have no science to prove any of this.
However one thing is pretty plainly true, there is a limit to intensity, volume (in humans) is mostly limited by available time.