Im not saying it's easy to counter pwerfer. I'm saying it easy to counter pwerfer COMPARED TO the calliope. It's far easier and a lot less at stack to try to counter pwerfer than it is calli. You can kill pwerfer with artillery if you want with no risk.
And I never said pwerfer was balanced either. Both need less wiping potential as you said.
I disagree that survivability of a non frontline isn't important. Unit preservation is always important. Every unit should be counter able. The reason you see so many complaints about heavies is because there seems to be no counter (even tho there are). What would you say is the most cost effective counter to an armoured mobile artillery unit?
i still stand by my opinion that health is tertiary factor to consider. although that means it is still something to consider.
anyway, i agree with you. as i said in another thread, calliope has no business of having the health of 640 hp.
it is a weird health to have. it is not high enough so that you can just park up front and barrage in full. but it is definitely high enough to make it survive a good enemy flanks or insertions which deserve to kill non frontline artillery units.
but i think the real problem is its barrage like P.Werfer.