They are my professional forces when I hire them, the line between mercs and normal soldiers was and still is blurry to say the least. The problem of mercs is more often about them being "foreign" rather than being merceneries. The dichotomy between professional and non-professional forces is between professional/elite forces and levy/mass/warrior-caste forces and merceneries were professional/elite force which did not prevent normal army from being professional; in fact they would often be integrated.You're not relying on your own professional forces that's why
The mechanic of Army professionalism is supposed to incentivize player to maintain a fully-funded standing army during peacetime and the mechanic of merceneries exists to give player ability to give their manpower a boost. They both exist to allow player spend extra currency for military power and given that manpower is ahistorically the limiting factor on army size, it makes sense to allow states to spend some extra ducats on soldiers without pointless punishment.
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