Let's see; I don't build any body guards (other then house carls in VI) although I do repair them. Rarely do I build urban militia as early spears are much better overall. Militia sergeants are also rarely built. Heavy steppe cavalry is too expensive for its usefulness. Crossbows, peasants, and thralls were already mentioned. On an opposite note, vikings seemed to be good anti-armor even in the late period; seemed similar to those Arab units. Don't bother with non-siege engine gunpowder units at all. No need for spears for the German factions in VI as Friedman are better by far. Probably others - just none come to mind off the top of my head.
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