Mormons have this notion of "deep doctrine" because their hierarchical governance seeks to instill reliance and trust on its leaders, whom rarely commit to stating things as doctrine because the memory of the unwashed masses is longer than they'd expect. So folks on the front line take notions spoken decades and centuries ago and try to fit it to a modern framework, even when things are obviously wrong.

There are, in fact, no Quakers living on the moon (Brigham Young), which we did arrive to in 1969 (Joseph Fielding Smith). This is why the White Horse prophecy remains relevant -- gets spoken about by Mormon leaders to young men over campfires and Sunday talks, in addition to a whole lot of other nonsensical mysticism and, worse, principles that are harmful to marginalized communities.