Wiki has replaced tutorials section back in eAthena days. I liked it but also disliked it, for several reasons. Tutorials have a personal view that a wiki article can't have. For example, in spriting, or RO pixel art in general, I'm sure I won't explain it as Adel or Gaypuff would do.
However, obviously, wiki is way more organized.
I suggested recently (via staff sections) to add IP content and this way people can create a place to post their guides. I have some guides I'd like to translate and add to rAthena, but I refuse to use the wiki since it doesn't look appealing to me as a place to post MY lessons xD. Not all graphics people may agree with my text and I wouldn't like it being modified by other people.
I contributed to the wiki, but not as much as I'd like because of this.