It's just they need to remove hardcoded limits, such as city limits even for modded games. We don't need zoomer interfaces. I dont even care about graphics, just remove the hardcoded limits, the modders will create something better than these greedy fucks.
Actually, there should be city limits. Rome age city population did have limits, and agriculture production supplied FAR less food than nowadays. ESPECIALLY in places like czech highlands or scottish highlands. Norway was kinda meh, but they had fisheries.
Frankly, environment factors were really important limiting factors. Rome didn't expand into czech basin for at least two reasons. There were no money to rob. And boars who lived in forest around "roads" had 500 kg weight (and were adrenaline addicts). South France on the other hand was nice expansion area where Rome could rob a LOT, and get a lot of taxes. Egypt as tributary was sweet and completely necessary for continued Rome existence.
Not including stuff like that into game about Roman conquest would be big oversight.