The step people had tons of horses but that doesn't mean they were cheap. Take horses (war horses mind you) in Greece or Rome. they were a luxury only affordable by rich people..
It depended on the culture I guess. And as far as HA are concerned, as I said, thdey're a real advantage against unarmored civs but, against civs like the Diadochi or Romans, they're usefullness is only marginal provided you don't let them outflank you. Even so, they won't be so usefull. In RTR they were way overpowered (I remember testing sarmatia out and being able to trash armies 3X the size of mine because of the attack value of arrows being 6 or something. that with the fact that every single unit were archers and the foot nobles doubled as elite spearmen... that was an easy camapign...
In EB with the reduced attack and the heavy armor of some units (from 10 armor (without counting shields or DS just armor) upwards things get tricky to HA from the front. And with 12 armor even the flanks get tricky...
Not to mention dosidataskelli or thorakitai agriaspidai as those guys are invulnerable to arrows. Only slings from the flanks seem to have marginal success against those beasts...
Cheers...
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