[recursivecaveat]

There are a lot of subtle consequences of 1UPT as well. You can't let the player produce too many units, or the whole map will lock up. You can't make units too expensive though, or they'll just be hitting next-turn 40 times between each production in the ancient era. So tiny cities have to punch above their weight, and big ones below. Once you do that though you have to heavily penalize expansion. What they really needed was to increase the tile-density of the map several times, give room to maneuver. That would seriously change the city management gameplay though, potentially make it too tedious.

[reincarnate0x14]

I can see a split of using large hexes for cities and strategic deployment but having 7 child hexes inside each strategic one for precise unit movement working out. Effectively limiting stacks to 7 units for combat, and also potentially letting a few groups of units move around each other with multiple turns of micromanagement.

The corp/army mechanic could also be tied into that.