Book 8 reframes the portion of responsibility as a protective boundary around immature love, not as arbitrary divine distance. God created a growth realm in which human beings had to mature before entering holy union with Him.
That makes the command in Eden a timing command as much as a prohibition. Adam and Eve were meant for love, but not yet. The boundary existed so desire could ripen into holy love instead of outrunning formation.
This matters because the Fall happened inside the realm of growth. The human task was not to suppress love but to let it mature under Principle until it could cross safely into a new realm.
In that sense, responsibility is mercy in structural form. It keeps immature people from treating intensity as readiness.