I find it very remarkable that so many people on this forum interested in history obviously seem to never have heard of constructivism. Now I don't pretend that constructivism is the only metatheory that one can scientifically adhere to, but insinuating that someone argues out of "political reasons" (gdj: #268) while quite clearly he just points out that most historical viewpoints are mostly eurocentric, is not only wrong, it is absolutely insulting. Just because something is "the least eurocentric or politcally unbalanced" (ibid.) whatever doesn't make that thing non-eurocentric.
It is bothersome that poeple have to face the accusation of argumenting "morally" or "politcally" whenever they state that viewpoints are always (subjectively) based on norms learned and/or gained and thus any rationalisation of anything is subject to these norms. Constructivism is an acclaimed theory in many if not all sciences and arguments based on its notion shouldn't be dismissed so easily and reproachfully. Sorry but this ignorance just rubs my nose.
Now I want this thread to come back to a productive discussion, that of fleshing out the africas for a DLC. Personally I would like to have an africa-focused expansions, because imho I'd often liked to play as an african minor - in fact, I could never be bothered to play as an american or middle-asian one. That is to say that we all are different players and have different tastes of whom to play. So I think it right for the OP to point out that it is strange that the americas have gained 2 expansions and europe gained 4, but asia and africa not one (central asia will get one). Again neither the OP nor I think that Paradox is in any way politcally incorrect. Far from it. They are eurocentric maybe, but so am I, and maybe the OP too. Which isn't a bad thing, just something to be aware of. That I think was the whole point of the OP's arguments the last couple of posts.
What I find difficult is not how to balance the game when changing/adding provinces. It's: what else would this expansion include? Just adding provinces and minors to the map hardly constitutes an expansion. I think by Paradox's standards it doesn't even constitute a flavor pack. So what new mechanic could accompany an expansion focused on Africa?
After reading this thread (which in fact mainly focussed on the question if it is okay to flesh out africa in any way, because the scramble for africa didn't take place before the late 19th century) only two main topics were suggested: better colonialism and better slave trading. Both mainly focussed on the trade mechanics (which I whole-heartedly agree should be better). From my experience playing, colonizing asia was always a bit of a letdown. The wealth of the netherlands for example was dramatically dependent on their colonies in the east asias and they were an important player in the 17th century mainly because of that but in EU4 this is not the case (unless I am playing totally wrong but I haven't yet figured out how to historically model that in the game). So for me tuning colonialism should be first made focussing on east asia before africa. This as well would follow a historical timeline (i.e. first a colonizing america expansion, second a colonizing asia expansion, last a colonizing africa expansion).
Slave trading on the other hand (though grossly disgusting, that needs to be said) could open up possibilities. The arguments made of inland-vs-outland "states" in africa were among other things pointing to trade incentives. What I find extremely lacking in EU4 in general is inter-state trading. We have strange icons that represent stuff being produced in provinces and some weird numericals that should say something about demand or some such. We also have a percentage bar "representing" mercantilism. In fact EU4 is a grand-strategy game almost completely lacking strategical trade incentives. The only exceptions are hard-wired trade-nodes that never move. Now how historical is something like that? Of course I know that changing the trade system is extremely difficult and teaching the AI even more so. But honestly from what I can image such a change would constitute the only (?) reason to make an Africa expansion. (But that would be an expansion I'd pre-order)
Unless someone has some other ideas of what mechanic an Africa expansion could bring with it?