Yeah, "second" DLCs are actually pretty common. I remember being pissed when Charlemagne launched with the features that should have been in Legacy of Rome (that is, Imperial Administration). So, if you wanted a proper Byzantine experience, you paid twice.
Likewise with Tribal governments, as someone noted above. You got a glimpse at it with The Old Gods, but proper implementation didn't come until Charlemagne.
I wouldn't mind paying for a "Clans of the Sands" or "Voodoo Chiefs" DLCs to finally get proper Muslims and West Africans.
I don't really see how West Africa can work with the game, though. I usually defend map extensions, but West Africa generally doesn't hook up in a way that's realistic. It doesn't even fit in the EU4 timeline. I would hope that any expansion that helped flesh out West Africa would also at least attempt to represent the fact that Whites and jungles don't get along, so that you don't have Spaniards rampaging through the Sahel.
But, you also have the Chinese Question if you make the West Africa historically powerful/secure... in that it may end up blobbing all outside of its home territories. I think having Nomadic-province bridges pretty well solves that issue, in that there are diplomatic connections, but no real "invasion routes." Which is how it should historically be. Maybe an African king could end up transitioning into a horde, and you'd have a Black invasion of Sicily, settling down when they get there. THAT would be fascinating to make an AAR out of.
The Problem is... they CAN'T make this DLC. You can't use this DLC without Sword of Islam. This DLC would requiere you to own another DLC. This is something Paradox wouldn't do.This is not comparable to Chaarlemagne and LoR.
As part of a free patch... yes. But it's not possible as own DLC. Sadly.
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