because of the unique versatility of the game - that can include any time span from the history - it would be maybe a good start to develop in sort of “packs”. Packs that would include mechanics for specific ages like, let’s say, for the age of the Roman Empire. How things got handled in the Roman times is incomparable to how things were done in last century.
Of course, there are many similarities, like using soldiers and common people as fuel to keep the places warm and the fire burning (Kek).
If for example tanks, nuclear bombs and nationalism where THE things in the past century, as well as having many soldiers, the setup and application were different and this goes also for the acquisition of those things, the payment and the economy of the country at that time.
This idea may be nonsense, but still my goal was also to give ideas to others to think about.
tl;tr: Focusing the updates of specific mechanics for for specific ages that are compatible and useable together with other mechanics from other ages.