I noticed a parallel.

Taking a reductionist view is useful in Physics when people make things up. It is easy to characterise made-up things on a human level (like describing what elves look like), but not easy to give a description in terms of atoms (without making the elves easy to refute via observation).

Taking a reductionist view is useful in Relationship Theory when people make things up. It is easy to characterise made-up things on a human level (like describing the effects of a supposed obligation), but not easy to explain what specific event created the made-up obligation.