The "complete" part is thanks to thousands of fans contributing content, the "shitty" part is "thanks" to the company that makes money from that crowdsourced content. It's the same sad story for lots of wikis, some of them pretty high profile like Wookiepedia (Star Wars), Memory Alpha (Star Trek) etc.
Yeah, I recently replayed Minecraft vanilla and I really don't understand how you are supposed to discover The End with regular play. They do have some light hints for constructing a nether portal but I couldn't find anything pointing at how to discover the end.
In MCs case a wiki is such integral part of the game it should almost be integrated.