[mvolfik]

This article seems to miss one important point: how to ensure that links are added correctly and enough). In the wiki scheme, when you just dump info about a problem on a page, how do you now find pages where you need to link to this new page? If you solve this, you have just solved the main problem with the tree system. And I believe that it's actually easier to find related places in the tree-ish structure, than if there is seemingly infinite amount of free-floating articles.

And Wikipedia has a tree-ish structure too, after all - look at portals, categories etc