Player's Handbook, Monster Manual, Dungeon Master's Guide, Hoard of the Dragon Queen, Rise of Tiamat, and -in a couple week- Princes of the Apocalypse. All in eight months. With the DM Screen, they're just shy of one product a month.
While WotC may not have written the Tyranny of Dragons adventures, they were still the publisher. It's not *that* different from the dozens of other books principally written by freelancers published in the last dozen years.
It does matter when Wizards doesn't actually do them. When the design team isn't the ones working on it and they just slap the D&D logo on it, you have to wonder what they are doing. Once again, AP's aren't something a lot of people use so I wouldn't call them support.