In "The Changeling," why didn't Captain Kirk, as the "creator," simply tell Nomad that it was being reassigned? Tell the probe that its new job was going to be counting space particles (outside of the ship, of course)? And that he, assuredly, would check up on it after a set amount of time?
It doesn't seem like Nomad would question such a reassignment. Not at the beginning of the adventure, at least.
I'm looking for in-universe reasons.