It was, though, the Smoot hearings that led Joseph F. Smith to issue "Manifesto II" on polygamy in 1904, which historians regard as more of a "true date" in which the LDS turned against polygamy.
So many manifestos, so little time....and Section 132 remains untouched.
Oh, yes, it's extremely useful, because it shows the outright duplicity of the Mormon leaders when they were called to testify before Congress.
LDS apostle John Henry Smith told Congress he had trouble remembering his own birth date. One witness said that [LDS prophet Joseph F.] Smith must be employing his words differently from the way most men ordinarily use them...His testimony was one of the most damaging of the entire investigation. (B. Carmon Hardy, A Solemn Covenant, pp. 252-253)