Hi Chris..S,
Ted is in a better position to answer this, but I think the move mainly has to do with two things:
1) We can now use the same user base as the forum, so that people can use their forum login to login to the wiki. Then any forum user can also edit the wiki. With DokuWiki we had to add users manually (or they would have had to register again).
2) It's easier to add langauges, as it's easily done in a template that is added to all pages.
A third reason could be the Table of Contents, which works kind of ok now, although a bulletmenu like menu would have been the ideal.
DokuWiki is great. Last time when we were looking for a good solution for the documentation we looked around quite a lot and for the needs then found DokuWiki best suited. But as the documentation writing didn't really take speed (I'm partly to blame for that, as that is one of the things I've been offering to do), something had to be done.
So apart from the above two reasons it hasn't really anything to do with how DokuWiki works.
but I am genuinely interested in your feedback and criticism. As members of your own open source community, you'll appreciate you get lots of questions from people new to your app, some discussion amongst people committed to project and its further development, but rarely do you hear from people who have tried it and moved on or simply given up in frustration.