Without the environment, to dictate the capabilities and the demands appropriately, it would be foolish and not very good diplomacy. You have to understand the extent of your factions abilities, resources, loyalties, etc, before engaging in any business.
Promises and pretty words are nice, but ACTIONS, are the real currency of any diplomatic situation.
That aside, creating a world and populating it with ideas. Is exactly the reason I have fallen in love with the game!