I don't think Artillery or RT is over powered, but that's not to say I don't think its very powerful, but when you spread your infantry out it tends not to do a huge amount of damage and very rarely hits on target.
Sure it can be a real pain in the butt to cancel out. RT seems to work much like heavy tanks where more often than not they just cancel each other out.
I'm not a fan of Artillery so when I host a game I normally tick the no RT box so the heavies indirect weapon you get is the mortar which is quite powerful enough.
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