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As the title says: should the Chaos roster receive harpies, specifically to help them deal with flying units?
I would argue yes, as Chaos has just about always had issues dealing with flying units, with notable struggles including vs gyros (which basically require a 1000gp+ investment in an exalted hero on a maticore, eats a rare single entity slot, and can quite be countered by good micro on the opponents part), terradons (skink chiefs in particular, though not as strong as before, can still poke down high-value targets with little the chaos player can do about it), and deck-droppers.
Harpies would help with these situations by providing a cheaper screening unit to help defend against such aerial threats, but can still be realistically defeated by opponents and won't give Chaos a powerful air presence (best they could do is Chaos Dragon + 2 Manticores [most likely exalted heroes to avoid rampage] + 2 harpies, which wouldn't be that strong insofar as air-armies go but could occasionally surprise an opponent). Overall, I think it would be to the benefit of most of Chaos' matchups without breaking any of them in chaos' favor.
Edit: forgot to add 2 more points in advocation for harpies being added to the Chaos roster:
First, it is thematic for Chaos: harpies are chaos creatures (hence their presence on the beastmen roster).
Second, it will help Chaos against kiting builds in general, something which Chaos struggles against due to their relatively slow roster.