I don't think this sounds facetious. People and their life experiences are essentially inextricable. Nature vs. nurture stuff.

Separating/abstracting person from their experiences is as you say, a representation of a different, non-existent person - a mutant. Or worse still, some kind of dissection.

Disliking peanuts and being allergic to them each motivate abstaining from eating peanuts, an imitation of that person that abstained from eating peanuts without insight into why would be a rather pale imitation indeed.