Damaging wards

So i think it should be possible to reduce to the duration on by damaging them (ex. hitting the ward 2 out 3 times would take away ~15-20 seconds), I'm sure there's people that think so too, but is there a reason this isn't already a thing? With this it might also give attention more towards bringing zombie ward. Maybe i'm missing something or it's just a trivial topic. [sg-syndra]