Having a soul mate does not obviate hard work. A better title to this article might be "There are no "easy buttons" in marriage."
My wife is one of the smartest and most rational people I know, flat out. It can still be quite a bit of work to communicate. (The stuff we argue about is the stuff that falls below the level of conscious verbal communication.)
Since I'm not completely clear on what you mean by this statement, it makes for a wonderful thought experiment.