Games like EastFront or Combat Commander, or other games with activated ZOC (zones of control) are interesting as you are made to juggle the push/pull of enabling Headquarter blocks or Leader counters in order to activate other units in their surrounding ZOC. It's not as though units outside of a ZOC cannot act, only that they do so at the expense of being less efficient strategically in respect to the overall meta-game, whereas effective use of your ZOC can maximize results. Even in the context of IGOUGO, little things like this add an extra layer of strategy that I enjoy.