This is the part where I tell you all how capitalism is predictable as fuck by pointing out I literally called this day one. I said that paradox, due to DLC getting stupider and stupider over the years, sprite packs and such, would eventually release a "DLC" that would be very small and basically add some flavor events and a new UI design to muslim rulers, but the real "DLC" would be the patch, that made muslim ruler unplayable without buying the DLC. You just watch, they're going to do the exact same thing with Pagans and Mongols, the first legitimate expansion to CK2 will be an expansion that spreads out to India and western Asia.
This is all bullshit and I guarantee that the next title Paradox releases will have DLC just like this, only it will be unjustifiably expensive and people will still buy it. It's the same route 90% of all game developers are taking these days. Eventually games are all going to be made by some form EA, where you get 10% of the full game on retail purchase, then you have to pay to play the rest of the fucking game, that should have been there from the goddamn start.