Well, originaly it was rock, paper, scissors, lizard, Spock. But some people has hard time to get it. It seems that next time it should be even more streamlined to satisfy an average US citizen.
What about coin toss?
I know you want to look smart, but you don't address the point? And you let slip your bigoted views at the end of our tirade? What is this?
As Raze said: The possibility of disagreeing is needed for the traits. For example: independent/obedient
btw: Calm down, no one forces you to play this game wave
Raze point is weak to begin with, but you fail to parrot it properly...
On top of that, you chose the worst trait possible to give as example: obedient.
When characters disagree, whatever the outcome they get the traits they chose anyway: it's only the story outcome that becomes somewhat random in solo mode (which is the contention point).
What Raze said is that Larian tied the traits to two things: stat bonuses and story outcomes. And they felt that if they gave complete control over story outcomes (they already give complete control over stat bonuses and which trait you get), it would make the trait system just another set of dumb bonuses in solo mode (the disagreement system works ok in multiplayer).
Thus, the disagreement is the very design of the trait system: it is a set of bonuses that give you random frustration if you want fine control over it in solo mode. It is not a need, it is a design choice. Some players will enjoy the randomness and the frustration (frustration is not always bad), some others won't.
In multiplayers, when players pick different traits options, it remains rather easy to control the story outcome if they can agree: they just have to flunk the RPS minigame. If they fundamentally disagree about the story outcome they wanna see, then the RPS mechanics is there to arbitrate, which is fine.
In solo mode, the computer takes control of one of your character during the minigame and is always fighting against you. No negociation.
This is not pleasant, and many players use savescumming (or allocate charisma gear smartly) to get around it.
So there are get around in solo mode. In the end, the system is a little bit annoying but not so much, and can satisfy everyone with a little work: it is not the biggest problem.
ps: It is entirely possible to abuse uppercases while remaining calm. Happy to educate you.
