I get what you're saying. I think the way to look at Pharaoh is that they're making a game in the vein of Shogun 2, rather than Rome 2.
So the goal here is not to portray the entire Bronze Age, but rather to create a game about a particular piece of Bronze Age history and do that in detail. Specifically the period at the end of the 19th and beginning of the 20th Dynasties of Ancient Egypt, when internal conflict within the Egyptians, Hittitites, and Canaanites, as well as a series of natural disasters and the arrival of the Sea Peoples overthrew the old order and changed the path of history.
As for the start date, the game begins during the reign of Pharaoh Merneptah, so that puts it somewhere in the window of 1213 BC – 1203 BC, likely closer to the latter. They've talked about how Merneptah is on the throne of Egypt when the campaign starts, but after a while he will die, triggering a succession crisis. They said something about a Legitimacy War or Wars, so considering all four playable Egyptian leaders historically became Pharaoh in the space of about 50 years, I think it's fair to say that you'll probably be fighting one or possibly multiple civil wars in this game, first to become Pharaoh and then to retain it.
(Hittites have a Great King, which sounds similar. And interestingly it sounds like you aren't locked into whether to be a Pharaoh or a Great King by culture. If you want to be an Egyptian and stake a claim to the Hittite Crown you can, though it may not be that easy to pull off.)
I also think that probably suggests there will be several turns per year, I'd guess at least four, just because they aren't trying to portray centuries.
Anyway, basically I think if you wanted a game of the whole Bronze Age, then yes you may be disappointed. But if you accept, okay they aren't trying to do that, they're doing more of a zoomed in detailed portrayal of the Egyptian vs Hittites Vs Sea Peoples conflicts, it could be a lot of fun.
All the Best,
Welsh Dragon.