Why is the saying "Happy wife happy life" considered a popular saying when it promotes a one-sided view of relationships?

Why is the saying "Happy wife happy life" considered a popular saying when it promotes a one-sided view of relationships, implying that a man’s happiness is dependent solely on his wife’s contentment, while disregarding mutual respect and happiness?
Why is the saying "Happy wife happy life" considered a popular saying when it promotes a one-sided view of relationships?
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