That being said, maybe we're such a minority that virtually no human group would be comprised of only that kind of mind (even in couples).
I cannot imagine a non-trivial environment where everything is deterministic and there's no room for argumentation. For example, when deciding on the color of a new logo, or what to do for a company trip, there's no obvious canonically true solution. Therefore, opinions and personal preferences come into play, which is a source of conflict.
Ha, those are great examples where I will absolutely refuse to give my opinion :)
"What's your idea on the new logo color?", "I don't care, I'll be ok with whatever you choose", "No really, tell me", "No really, I don't want to think about it", "I don't get it", "I know you don't". Quit harsh, I conceed :)
Related: bikeshedding and https://en.wikipedia.org/wiki/Law_of_triviality
In addition, I've always been of a very analytical mind, whereas our songwriter has always had a very artistic temperament. We philosophically disagreed about whether music was primarily art or science. But he had the spark of artistic inspiration to write the songs, and I had the music theory backing to write the accompaniment, so that philosophical tension actually made the whole thing work. Then we split to pursue our respective goals and neither of us have done much musically since then.