My opinion (and this is just my opinion) making the room pitch black is just setting up for problems. What do they do for day sleeps if they aren't home? Will their daughter only sleep in pitch black darkness?

Personally I have found no relation between the darkness of the room and sleep. Jazz has slept well on a rug outside at a picnic, and slept shocking at night in the darkness. And vice versa, she's slept well in the dark, and not well in the light. If she's going to sleep she's going to sleep with or without pure darkness.