The beauty and - at the same time - bane of collaborative environments such as Tiki Wiki is that everyone contributes their own ideas, not only about how to move forward but also about how documentation should look like.
As far as I can see Tiki Wiki is 10+ years old which means it has gone through several evolution cycles and it looks like a mature product, for the most part.
Since it's a mature product, this inevitably also translates into older contributors moving on, new contributors coming in and adding things their own way.
One of the reason I was attracted to Tiki Wiki is the philosophy of
Does something need improvement? Roll up your sleeves and help change it for the better.
Since this has been my own philosophy as well for the past 20 years, a place like Tiki Wiki feels like home, even though it's only been just about a week.
So, I'm not suggesting Tiki Wiki documentation system is perfect. But there will be always people open to feedback and ready to help make it better.