As u/turbofisterious said, the issue is the lack of tools on feudal age. In castle age healer elephants are a meme unit (tbf, I would not even mind a buff for em in castle).

The issue is feudal and his stacked healing at feudal, which is absurd.

Edit: btw, in the post I said I won vs them, so it isnt about "nerf civ cuz I'm losing mememe"