However, I'm not sure why it would be considered something that doesn't provoke attacks.

If someone is flashing bright stuff in my eyes and I think it is likely to stop me seeing, I do something about it.

Blindness is a very powerful skill. I'm not sure I'd give it to yet another class.

If other people do like it though, I'd say that it sounds more like a trapper sort of thing to me. It's essentially a grenade.