@ Lyander ... this thread isn't about the differences between Kingdom and Empire.
this thread is about making Squads more normalized to *force* the game to have a good combat system.
Without a good combat system, this would never work.
I have plenty of ideas on how to make Empires different than Kingdoms. It just happens that the current "game" your playing is designed in such a way to make you think in a certain way.
As an example ... Empires could have faster population growth at lower population levels.
Like buildings that increase pop growth by +2 until it reaches a population of 200 pop, or 500 pop, etc ... so at 1 pop your city grows at 8 per turn, plus. Meanwhile, at 1000 pop, it only increases at 2 per turn.
As far as unit sizes go ... I think its silly for Kingdoms to have larger squads, because *in the lore* most people are fallen, and fallen soldiers are just cannon fodder.
*Ergo* one thought I had (with static squads) was that, say, max unit size is regiment. Kingdoms have 80 soldiers, Empire has 100 soldiers.
That would be theoretical squad maxes for Kingdom vs Empire "regiments."
now, as to relative differences, Kingdoms have A) better experience/training for high level units,
better formations/ tactical options and leadership abilities
meanwhile Fallen have A) stronger heroes/ fewer yet stronger NPCs, and
more, cheaper soldiers with quickly replacing populations ... ergo less maintenance costs
Kingdoms meanwhile would only have straight-up Prestige ... ergo their pop growth is *roughly* the same regardless of population (however I would like to see a small "pop growth-by birth" mechanic thrown in)
Add in an assumption of taxable population ...
and you get the Kingdoms being a more stable nation with generally fewer soldiers, able to get bigger cities somewhat more quickly, and higher tech somewhat more quickly ...
Kingdom soldiers also have the distinction of being able to gain levels ... which should some-what alleviate the lack of numbers and "initially" weaker heroes. Weaker heroes should be allieviated somewhat by there being more Experience-giving quests available for Kingdoms than Empires. (meanwhile Empire heroes level up through raw conquest)
Kingdoms also get more use out of their fewer, sometimes *weaker* soldiers by having many formations, and morale boosting leadership abilities ... to get the most out of what they have. And what they have will generally be higher tech than their more numerous, sometimes stronger Fallen adversaries.
Empires work best keeping low-pop cities (producing little in the name of gold, knowledge, or magic) popping out large numbers of soldiers. Its assumed that there are plenty of fallen in the countryside, but that they only gather near the cities (where the research happens) when they are needed.
Obviously Krax wouldn't work *exactly* like the Fallen, but they would possibly have some elements of Empire/Fallen and some elements of Kingdom/Man ... that all depends on which techs (and thus which buildings/ equipment/ formations/ bonuses) they get form their race, and which techs they get from their allegiance.