User blog comment:DaNASCAT/Technical Update: August 16, 2011/@comment-4053809-20110817174436/@comment-4053809-20110817182342

Hey Rappy - I'll copy/paste Dopp's previous explanation since she is the community team rep for this particular change and has the details (also, this change was released just days after I started so she has a better grasp on the decision): "... here's what it adds:

It allows readers (you know, the people you're building the wiki for) to see what they expect to see when they click on a category link: a list of pages that use that category. In the old system, they were launched into an editing page, which made absolutely no sense whatsoever.

The two main issues are that (a) it makes it harder to keep categories clean, updated, and organized. But editors who handle that work still have tools under SpecialPages to help with that (maybe it's not as smooth, but it's still there). And (b) if you misspell something, you won't see it right away... but auto-suggest has been making life better in that department for awhile now.

The change is forcing you to adjust the way you do things a bit, and that's annoying, I understand. But it's also making the experience of visiting a wiki make a lot more sense, and the folks who made the decisions on this feature believe that's worth it." (http://community.wikia.com/wiki/User_blog:Dopp/Technical_Update:_June_28,_2011#comm-305508)