You answered your own question. ._.;
It's absolutely impossible to choose any strategy if you can't even see if it works. E.g. You're a Archer class and wear Immaterial arrows. Those can be a big advantage if your enemy uses GR. But if he / she doesn't, you're damage will be ridicolous. Also, how could you know which tatic to use? For many classes coma is a big part of their tactic, if not the only thing they can attack with. I think it's quite obvious, I'm speaking from the point of view of a gypsy so let me give an example. You fight a LK. So if that LK wears Usakoring, you need a very fast spam + the right element + high damage. If he wears Usakoring, you can either try to get rid of his shield ( which is close to impossible during WoE ) or coma him. So how could you distinguis which shield he's wearing? Maybe he wears double devis and since you don't see your damage, you try to coma him, ignoring a big chance to kill him. Maybe he wears GTB & has FCP and you Tarot the hell outt'a him without any result. I think you get my point.
However, it would be awesome to have a command like /effect, which could be /damage or /dmg or something, that just toggles damage off or on. :<.
I hate walls of text. ):.
