I think that many people may be misinterpreting what is being done here.
What it looks like to me is that they've broken down the concept of "Fighter type classes" (or, in 4e, the defender), or "Mage-type classes" (what in 4e was the controller) and just defined them slightly different.
So, rename "Mage" as controller. How does that change the core concept? I know, not all of the classes being put under the Mage core class are controllers, but they are all very similar mechanically (Warlocks and Sorcs were both strikers with lots of controller-y abilities).
The way I see it, the core classes are just their way of renaming Defender, Controller, Leader, Striker.
What it looks like to me is that they've broken down the concept of "Fighter type classes" (or, in 4e, the defender), or "Mage-type classes" (what in 4e was the controller) and just defined them slightly different.
So, rename "Mage" as controller. How does that change the core concept? I know, not all of the classes being put under the Mage core class are controllers, but they are all very similar mechanically (Warlocks and Sorcs were both strikers with lots of controller-y abilities).
The way I see it, the core classes are just their way of renaming Defender, Controller, Leader, Striker.