Can't sign on with that. Subordinating one's own desires to the other or to the relationship like that isn't healthy, even if it's mutual, and I'm pretty sure my own marriage wouldn't have lasted this long if either of us had tried it. "Two servants" doesn't work. I think O. Henry even wrote a story about where it leads, and can lead even with the best of communication. Consciously or no, sooner or later one person will demand more and - lacking any directive that would pull things back into balance - you'll have an unequal relationship. IMO treating each other's needs as exactly equal, no less but also no more, does provide the necessary pull toward the center and thus is more sustainable long term.