I'll say let's discuss this once EBII is out XD
And for the "barbarian" unit size, it's historical accurate to have their number of "professional" soldier lower than the mediterranean factions, they didn't have the means to support such forces, but they had a superior warrior ethos in overall...
Also the legionary cohorts represent the great pool of trained manpower the romans had access to during the late republic, while the hellenistic factions, after the death of Alexandros, all adopted the system which Philippos developed of specialized training for the middle-lower classes giving them huge numbers of soldiers capable of doing the phalangite work...
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