I think FXS could massively improve the game just by giving a few buildings an alternative building like the barracks / stable, having a few more map based effects tied buildings (eg Building x buffs Bonus Resource y) or just more dynamic, and reworking Rationalism etc. As I’ve suggested elsewhere, I think having additional Governors that unlock later in the game (allowing Players to more clearly have “core” cities) and having some sort of Vassal / more meaningful Colonial Cities (to encourage late game expansion, and create a more clear “satellite” or “secondary” cities) would also help.