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The shamu article is really about creating healthy boundaries inside of marriage.
It's hard in any relationship to keep your distance in a way that is healthy, especially when it comes to the things about the other person that drive you nuts. When you demand and nag a person to do what you want after not getting results, it subconscously becomes about domination - "I need you to do what I want." In the end, you just want to be happy with your partner in an environment that allows that. By complimenting the things they do right, it changes the way you think also - you start appreciating the good thing as opposed to focusing on the bad.