One of the tips Civ 4 suggests is that it is not always a good thing to promote units immediately. I'd like to expand on that concept based on a flaw I've noticed in AI strategy. Some promotions, such as the City Raider line, are absolutely useless for defensive purposes. As a result, there is no benefit to giving a healthy unit such a promotion immediately instead of waiting. If nothing else, waiting to promote the unit makes it possible to take advantage of the healing effect that comes with promotions if the unit gets injured before it has a chance to take advantage of the planned promotion.
Also, deferring such promotions leaves more flexibility regarding how the unit will be used. What if the unit ends up having to fight in the open field before it can reach a city it can use a City Raider promotion against? What if changing conditions make it more valuable to use a unit defensively than to use it offensively? Sometimes it makes sense to change plans for how to use a unit, and to wait until you build additional units to go back to the original plan. But if you've already given a unit a promotion that essentially locks it into a particular role, you lose that flexibility.
Also, deferring such promotions leaves more flexibility regarding how the unit will be used. What if the unit ends up having to fight in the open field before it can reach a city it can use a City Raider promotion against? What if changing conditions make it more valuable to use a unit defensively than to use it offensively? Sometimes it makes sense to change plans for how to use a unit, and to wait until you build additional units to go back to the original plan. But if you've already given a unit a promotion that essentially locks it into a particular role, you lose that flexibility.
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