@thedog Just as a casual player:
I would suggest having a simple victory condition as much as possible and having somethings that may prevent early surrenders if things goes bad. I mean for example in almost all TripleA scenarios; If a situation get worsened for a nation or alliance in the middle of a game, they could never turn the tide because of the cumulative nature which often leads early surrenders. Once I have requested implementing "draw" option because with that the loser side gets a new goal.
I think playability and balance should always triumph over realism if they conflict.