Frankly, I actually like Theurophoroi, as they're basically Hoplites with javelins. Sure, they're not as resilient as hoplites, but have good stamina and beat up most things with the same cost. Replace them with Thorakitai if you can, but I like having 1-2 in my Epeirote fullstax to deal with weaker units and to flank without wasting much stamina. They're consistent, reliable, and efficient, especially if you're on a budget.
Gaeroas are actually decent spam-troops for your frontier provinces as Rome and some other factions. However, like many early barbarian troops, they're extremely vulnerable to missiles, and if they're flanked, they will die. They're good at defending cities if you have no other options.
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