I don't know if you're being sarcastic but no it doesn't. The same that happens in the MLB can happen in the NFL. A crappy 9-7 or 8-8 team can make the playoffs just by winning its division, not only that they would also get a game at home.
I know divisions and conferences exist to avoid extra travelling miles but if it was up to me I would just have everybody playing everybody with the top teams getting to the playoffs.