Because even though those regions encompass the historical regions the Makedones occupied, troops like Pezhetairoi and such where only recruitable from urban populations, meaning the southern ones which where wealthier and more advanced.
Epeiros and Makedonia might be of similar ethnical origin (both of them Hellenes, or rather the ruling class from which the elites are trained), but they had different principles and ideals. They also advanced sepparetely, meaning they had their own troops, tactics and such. The Epeirotai may have copied Makedonian troops, but units like the Hypaspistai, Hetairoi and Pezhetairoi where only available to Makedones. The only thing the Epeirotai could do, was to copy such units, like the Molosson and Chaonion Agemata in EB.
Maion
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