It is not that we only WANT two teams. It's that we only GET two teams. It's an emergent property of a broken voting system. If somebody in the US says you can't or shouldn't vote for another party, that's their interpretation via some kind of game theory thought process to prevent an even worse choice from winning.

That probably isn't relevant any longer, and it's more clear than ever that the system was never improved because it is a great form of control that parties and individuals won't catch the blame for. Thus all the discussion of "alternative" methods of political change.