That's precisely why it would be interesting at least to think about it, though I doubt Civ will go in that direction at all. I do agree that it will not work for all and you definitely would be have to be linear with some such as playing through six Chinese dynasties with maybe a Mongolian in between.
I am wondering what kind of approach Humankind will make such as will they have both a Renaissance Elizabethan England and then a Victorian United Kingdom as separate Civs or will they focus one area of their history?
This is what I’m wondering too. It looks like you have a choice of ~10 options per era.
I’m expecting this means the usual suspects in their appropriate eras (Ancient Egypt, Classical Greece, Medieval Khmer we already know about, for instance), but there’s also room for multiple appearances from the “same” civilisation. So we could see Classical Rome alongside Medieval Byzantium, Achaemenid/Sassanid/Safavid Persia across the Classical/Medieval/Renaissance, and Imperial Russia alongside the Soviets in the modern era.