Humankind was announced with a 'Neolithic Era", but that's not really what it is, it is a Pre-Era: no cities, no real technological or social development, just a chance to find a better First City location, explore the map, possibly meet some other Factions.
This is not a bad concept, but it's too limited. There were cities in the Neolithic - lots of them. But no, contrary to nationalist legends no later Civilization started in the Neolithic, despite some pretty substantial 'cultures' that did exist then. There simply is no direct relationship between, say, the Cucuteni-Trypillians and anybody living and building in the Ukraine/Rumania later, no connection between the Peiligang or Xinle cultures and the first Chinese Dynasties except a shared taste for millet and/or rice.
That means that Humankind's disconnect between Neolithic and 'Ancient' or First Era is not incorrect, and not choosing which Civ you are playing until the end of the Neolithic would not be a bad mechanism for Civ VII.
The trick is to make the actions in the Neolithic more meaningful than they are now (at least in the latest glimpses) in Humankind.)
IRL, during the Neolithic they were making pottery, domesticating horses, cattle, sheep, goats, and water buffalo, exploiting coastal fishing and whaling, traveling to islands by boat complete with their domestic animals, working with low-temp metals like copper, silver, gold, and lead, and trading with relatively distant people for sea shells, metal, obsidian, and possibly 'manufactured' goods (pottery, jewelry, wool cloth). That means, at a minimum, the Technologies of Pottery, Animal Domestication, Agriculture, (primitive) Metal-Working, and (primitive) Boating should all be at least possible to achieve in the Neolithic.
On the other hand, many of the Neolithic cities collapsed and disappeared for various reasons, so starting your first cities in the Neolithic should be a chancy proposition - with some kind of mechanism to keep a Failed First City from being a Game Breaking Disaster. I suspect that one way to do this would be to make the Nomadic Civ or Pre-Civ a reasonable strategy, capable of some Tech development as well as population increase, so that having a city fail and your people go back to being nomads/pastoralists does not set you back to Turn One. That woild make the choice to found a City early jus that: a choice between equally-viable strategies, not a Requirement for any further progress in the game, as it has been in the Civ games since Civ I