Although trial and error is a way to learn, I think the hostility to teaching DMs or explaining the base assumptions of the game is saddening
As a whole it think D&D (minus 1e and 4e) was and still is too chicken to describe the details of its base assumptions. Mostly to enforce DM freedom.
For example, the point of Command is either action denial, causing a disadvantage, or limited forced movement. Not damage nor long term effects.
Therefore this should be say.
"The spell fails if the target is undead, if it does not understand your command, or if the command is immediately harmful to it, cause indirect harm to it, or cause major loss to it after one turn"
So no "Renounce" to make a priest lose its magic.
No "Abdicate" to make a king give up their throne.
No "Give" to make the demon hand you its magic weapon.
Want those effects, create a new spell.