I remember RCM. I don't know about light armor, but as far as I can remember, heavy armor was a *****. I forgot what mod used it, but the mod featured town sieging, and heavily armored units were almost unkillable thanks to RCM. One battle involving only 8 units could take as long as 5 minutes. I don't know if it's been changed since then, but it didn't sit well with me