At the same time, when the first thing most players do after installing World of Warcraft is to look for a custom interface at one of the humongous sites dedicated to providing them, and people constantly talk about a list of “must have” addons, it becomes obvious that the default UI is sorely missing much needed features that should have been available right out of the box.

This is not a problem unique to WoW, it applies to any application that presents themselves as being extensible. The same charge has been levied at Firefox again and again – why don’t the developers look at the top five extensions people are using and incorporate them directly into their product?