Meh, I've got Thracian peltasts with their AP swords and more javelins for flanking, or any number of other troops better-suited for the job. Perhaps because I don't use any phalanxes I don't get the same value out of them I might. Invariably I've got more than enough cavalry to drive off anti-flanking cavalry anyway. The AI doesn't seem to recruit more than three or four units in any one stack, and I've usually got five in a full one.