Do you ask for a reason to introduce unit attrition?
Exploration, colonization and offensives would become more difficult and expensive. In the existing civ games, those have been far too easy. Civ strategy is just about expansion, since building and conquering new cities always pay more than developing the ones you have.
It is realistic, too. Soldiers who cannot find food or shelter in the terrain will eventually die. Ships will sooner or later run out of supplies. A band of warriors shouldn't be able to cross the Sahara without special equipment or training.
Exploration, colonization and offensives would become more difficult and expensive. In the existing civ games, those have been far too easy. Civ strategy is just about expansion, since building and conquering new cities always pay more than developing the ones you have.
It is realistic, too. Soldiers who cannot find food or shelter in the terrain will eventually die. Ships will sooner or later run out of supplies. A band of warriors shouldn't be able to cross the Sahara without special equipment or training.
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