and most of the hoplitai in Makedonian armies would have been Hellenes, not Makedonians, thus we used shield devices from those regions and city-states which most often contributed troops to their armies.
as for IFF difficulties, the "royal" units will probably end up being more uniform than they are now (single color or shades of a single color on all their shields, for example) which will help to some extent, though the colors may actually be very similar between Hellenistic kingdoms. Just remember, we'll have men carrying banners, that'll help.
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