While I agree that docu is important I've seen my share of garbage poured into wikis and presented as the single source of truth. It takes a lot of time and effort to make docu meaningful and useful with the outlook that it's ignored and overlooked anyways. Quality documentation is expensive, and, if one invests heavily into it there must be a clear workflow path that makes following and reviewing docu mandatory. Documenting for the sole reason of existence of docu is counterproductive.