The civ-olution over the ages/chapters is not a bad gameplay decision. It does make the game richer and arguably also justifies a higher price via add-on content. The main issue is that the studio went about it the wrong way. They have simply not studied the player base well enough. They could have achieved the same game economics and mechanics with letting player decide on a meta civ upfront (aka "China", "America," or "Germanic") and then easing the player in with a starting combination like "Han" or "Gaul". Depending on the gameplay decision and narrative events the player engages in, this could have evolved into "Tang", "Song", "Ming" or "Norman", "Frank", etc. You get the sense of it. I think in a CIV8 that would be the most reasonable workaround. The current system, which I don't hate, still has "humankind" vibes; for instance, when Machiavelli gets to take Spain and Isabella comes out as Hawaii or some horse*hit like that.