They are arguably imbalanced. The EB guys seem quite happy with their balance though and won't change anything, so your post is falling on deaf ears.
My recommendation is to go the modders way: reduce Gaesatae stats a bit. I reduced armor a few points (since they have higher armor than many armored units!). This is in keeping with historical accuracy anyways, as it was the Roman pila that was the downfall of these nudists at Telamon according to Polybius. Two hitpoints and 5 armor is a bit high for naked men IMHO, particularly considering that they were easy targets.
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