Personally the big break was Civ 5 moving to 1 Unit Per Tile. This had huge secondary edfects that even Civ6 have barely quite managed to wrangle. Unstacking b

Personally the big break was Civ 5 moving to 1 Unit Per Tile. This had huge secondary edfects that even Civ6 have barely quite managed to wrangle. Unstacking both units and the cities has made a very different game now from the original Civilization Games. If you're still on Civ5, might I recommend the Vox Populi mod? Really improves everything across the board.