As I mentioned (and cited Church of Jesus Christ of Latter-day Saint documentation) previously in this thread, that is an interpretation by those specific individuals, not by the church as a whole. The whole of the Word of Wisdom says nothing about caffeine, it mentions "hot drinks", like coffee or tea.
Like any group, people choose what they want to read/see/hear/do. Having been a five decade "member", very little (if anything?) has changed doctrinally, but there has been changes in emphasis to point out pieces of doctrine that practicing members have misinterpreted.
If one believes Bible stories, I don't see what the issue is with how the Book of Mormon was translated. The method is a "fantastic", but plausible in my mind. "Joe Smith was a man, flawed like all of the rest of us and has a few issues. Some issues have been sensationalized the past 200 years to become "truth". There's a pretty interesting scholarly book called Rough Stone Rolling that takes a solid look at Joseph Smith, his flaws, challenges with interpretation, struggles to become a leader (this all started with him at 14 years old, he was killed at 39).
Members SHOULD read the whole of "scripture", The Book of Mormon (the book about groups settling in the Americas that testifies of Christ and his teachings), Pearl of Great Price (translated from scrolls after the Book of Mormon), Doctrine and Covenants ( very interesting collection of mostly Joseph Smith's revelations as the church is organized) and the King James Bible with it's Old and New Testament.
I assume like anything else I've been involved in, it's easier for people to listen and do what others tell them to do than to read and think for themselves. To me, the teachings are harmonious with the Old and New Testament. At worst, one would gain greater insight into "odd" Christian beliefs/practices if you read the LDS scripture.
I'd lay out how I feel about "the funny underwear" but am sure it would be dismissed. It is a bit offensive the tone that that is talked about in. Maybe I'm a bit sensitive? Probably? I usually have pretty thick skin.
Here's a Wikipedia link for garments.
Temple garment - Wikipedia I haven't read the full of it, but what I skimmed is seems fairly accurate.