There are dances that decide disagreements. Different cultures use dance for different purposes. What about dance contests? Break dancing? Krumping? People dance to attract partners, to establish social ranking, etc... all of which which are a forms of social contest.
It's by no means obvious that "any metaphor will do," which seems to be your point.
And all cultures have war. There are zero cultures that have replaced war with dancing and there's no reason to think this is possible.
I said "it's certainly possible to use different metaphors to describe or model the same situation." Then I described some situations where dance, not war or physical conflict, is used to settle disagreements.
Conflicts are part of social interactions. The fact we use war metaphors doesn't mean we use violence, it is the opposite, we are replacing old-fashioned violence with social interactions.