Perhaps I’m too old, but I can remember these golden times, when games provided a manual… 
Honestly speaking: I fully agree, that a management/tycoon game should provide some explanations and key figures about game mechanics. Perhaps not in an ingame-tooltip, as many people (like myself, too) enjoy figuring out these things bythemselves.
But at a certain point (or after a longer break from a complex game) I really enjoy having a document/function/manual, where I can find this… (Civilopedia, my longtime-buddy… 
)
As game is in alpha, it’s clear devs have other priorities, but @Olof perhaps that could be a small community project… 