If you can simply decide who wins the argument, then it isn't really an argument, IMO, you just have cosmetic dialogue options that don't really matter.
It's called a
role playing game for a reason! I'm role playing both characters, so the argument between the two characters is taking place in my mind. But instead of letting me role play both characters having an argument, the game takes over one and forces me to play RPS against it to resolve the argument. Even if it is just a "cosmetic dialogue option," it does matter because it lets me role play
my characters the way I want.
It should be a simple fix, just put a "give up" button for each character on the RPS screen to allow us to have a character give up and let the other have their way. This would also benefit coop play as well. When the RPS game was first implemented, I played a little coop with a friend. Most of the time if we disagreed, we talked it out on VOIP, and if we came to an agreement we would allow one or the other to win the RPS game. In those instances, it would have made it easier to have a way to give up and let the other player win rather than go through the RPS game. Other times if we couldn't come to an agreement, the RPS game is a good way to duke it out.