They killed much of the automation in the vanilla to tbc conversion, but didn't finish totally knocking it out until a bit into TBC. They've actually relented a bit on their addon stance and have allowed some figures back since then. I would have to look over the patch history on several addons to confirm dates but I doubt anyone really cares. Long and the short is, addons having been in a changing state is not new news.
As for the base UI, GC has repeatedly said they would like to improve the existing UI but it isn't a priority. They're not happy with the raid frames; expect to see them improved in Cataclysm. They want it to be closer to grid. Some parts of Grid might go over the line with them but on a whole they like addons.
AVR being disabled is interesting, but not altogether shocking. It does a great deal and much of that ruins the "game world".