Except you were just given a reason. You just don't agree with it. But when you have a franchise that has existed for 25 years that has always included certain 'characters' - the exclusion of those characters, while possible, is less likely because they're a part of the franchise.
It'd be like Releasing a Street Fighter game without Ryu. Entirely possible, but incredibly unlikely. Chun-li, Guile, Blanka, Ken... Lot's of core characters people expect to appear. Some of them have certainly missed games before but it's definitely surprising when they're omitted.
So on that note - I don't think I've ever played a game as the Germans in the history of the civilization franchise and have no personal investment in them, yet I would be shocked if they were ever excluded. They're just part of the game.
A civ like Mali, on the other hand, is not - and that's one of my favorite civs in the franchise so far.