The post I replayed to was not about French-centrism in the European pie of Civs but about the overrepresentation of Europe and this is how I understood it:
The thread is about French Civ.
Thenewwwguy said: "Please, we already got Normandy. we really need more indigenous americas, africa, asia and oceania in dlc since its too late to correct that mistake now" - you pointed Normandy and France (Civs) as a problem or mistake, and then you demanded a solution: naming Civilizations we need from every continent except Europe. Logically it literally means "Please fewer European Civilizations, because we have too many and this is a mistake".
As for Civs diversity within Europe. Well with only two Civs per age you will always have a dilemma - do you want six different unconnected Civs but well-addressing cultural diversity, or do you rather want one consistent Meta Civ like (Gauls - Normans - French Empire). It is very subjective. This applies to all continents, not just Europe by the way.
In general, I agree. Era system creates a problem of a small number of Civilizations.