The LDS Church currently teaches they have the fulness of the temple ordinances and all that God intended to reveal on the subject. Again, I totally disagree. The LDS Church did not previously believe or teach they had the fulness of the temple teachings. That is a recent claim and is simply not true.
Can you imagine a world without electricity, laptop computers, the Internet (I’m using all three right now) and cell phones? What would you do with yourself all day? How would you survive? What if you couldn’t get your medications from the local pharmacy? What if the local grocery store no longer had food to sell? What if you could no longer get any gasoline for your cars? Is that where the myth of walking to Zion came into the church?