JFS comments on how much more beneficial plural marriage is in eternity than monogamy.
Joseph F. Smith, "Plural Marriage—For the Righteous Only—Obedience Imperative—Blessings Resulting," Journal of Discourses, 26 vols. (Liverpool: William Budge, 1880): 20:30
But, indeed, the benefits naturally accruing to both sexes, and particularly to their offspring, in time, say nothing of eternity, are immensely greater in the righteous practice of patriarchal marriage than in monogamy, even admitted the eternity of the monogamous marriage covenant.