Noticed you never did get an answer, and I am busy scouring trying to find where I found this mentioned. Pretty sure it was in a live Q&A so it makes it slightly harder to ctrl+f.
The system does not push you to cooperate, it pushes you to meet. To be unable to ignore the other.
Soul mates are mentioned here Design Journal 2 Soul Selection Destiny Achievements and Soul Mates
Most importantly, soul mates whose affinity go in opposite direction become diametrically opposed to one another. To that end, there is only one way to get past such an antagonist – separate their soul from their body and send them back to the Akashic Records.
The tidbit I could not find again was the fact that they intended this to create story. To create a dynamic world where anything could happen. If you and your soulmate meet and you are both gladiators that go from tournament to tournament and fight for the crowds. Now you have a synergistic bond with someone of the same intent and your shows in the arena are even more grand. However if you and your other half are on opposing front lines in a war, now you feel a pull towards the enemies side. You don't want to slay your fated brother/lover/rival over some petty border war. I am rambling now forgive me, but here is the points; It is to make the world interesting! If soul mates were always beneficial then you almost Have to go find yours to have a competitive edge. The ability to know your two souls are inextricably linked despite yourself or even in favor of yourself is dramatic, its flavorful, it is engaging.