The implication here is that you use the collar to beat one of the bosses, which isn't a bad idea, necessarily. 4 Corruption = 8 days, and at least on a standard run it's rather unlikely that you'll manage to clear Forest of Danger on Day 9 (at least on Nightmare), and the extras that come with the refugee camp and clearing the quest early on are arguably worth it.
That said, I'm pretty sure beating the Ogre Commander w/o Collar on Day 1 is still in the realm of possibility with NG+ bonuses, though that would rely on a different loadout, favorable RNG, and perhaps more points to spread around for Light or more preferably Storm.