Exactly, because in my experience, the Aedui completley ignored the area, the Epirots were too busy fighting first the Mak's, then KH, the only faction that tried to seize the territory was the Getaii, and the Romanii much later on in the game, however with the Boii, after at least 10-15 years we would see a stalemate developing with the Boii and the Getaii, having the Illyrian territory neglected, whilst the Boii will either get steamrolled by the Swéboz, or the Romans much later on, in terms of game balancing, the Pannons would be excellent, creating a buffer state between Greek expansion along the coastline, preventing an easy Roman landing near the Epirots [provided you do not want to go to war with them] and transforming the Carpathian basin to an ongoing war zone such as Greece, or the Selecuids war with the vassal states.
However, in the starting period Illyria just doesn't seem to have that great an impact on the world, I could see them part of perhaps an emergent faction, not quite sure how that works in Kingdoms, im MTW2 you had two slots, one for the Timurids, one for the Mongols, thus creating a non playable Illyrian faction, that would emerge somewhere during 200 BC, however that destroys the dream of planting a Pannon banner on the Forum Romanum....
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