recruitment should effect city population like in rome 1
Im fairly certain this isnt in rome 2 as i haven't run into this feature in rome 2. but i cant confirm at the moment.
anyways, in rome 1 your cities had an actual population. Think of this as the number of able bodied men that the city could supply you with. Obviously recruiting armies out of well developed large cities like rome wasnt a big issue. but try recruiting from some of the smaller ones and you begin to notice the difference. not only does that small city lose population count if you build a stack out of it, the population loss also made it so that that town was no longer giving you the same amount of tax money (until population grew again. dictated by population growth modifier that could be made higher with certain farms etc.). this was a very cool feature as sometimes on the frontier of your empire, your city couldn't replinish all those losses you took even if you had the money. especially if that city was just recently taken by you and exterminated. you would need to either rely on mercenaries in the region or move your stack to a larger more prosperous city to recruit/replenish your forces.
this feature not present in rome 2 is sorely missed by me.
P.S. sorry if this feature is in the game