It only makes sense if,
a) you want PCs CDGing your guys too, and
2) your Action isn’t better spent elsewhere to ensure victory
Because if you win the fight, their healing potions become yours, and you can CDG them then. But I have absolutely seen fights turn from bad news for the PCs to a decisive victory and a quick revivify because the DM decided that a CDG was more in character than dealing with the very deadly remaining PCs, essentially wasting that enemy’s entire turn.
It could be a waste, eg if the lone monster only has 1 attack and it's not enough damage to kill outright. Usually it's several foes with ca 2 attacks each. Healing potions are only 50gp so nice but not great loot. Anyway CDG prevents use of healing potion, keeping it safe for the monster!

PCs rarely need to CDG NPCs since they usually die at 0. I tend to apply the PC rules to NPCs brought exactly to 0; though.