The question is this:
If you get an early Furnace out, should you eat a card a turn to keep their graveyard in check or should you leave the yard so when you go off, you can draw out your deck?
When I play an early Furnace, I eat a card per turn.
This action can make you win the game against decks like Slaver, Dragon (by eating Squee and Dragon), ...
When you go off, you eating your graveyard to draw.