I can't speak for fighter, but if I have WW attack on with my tinker continuously I just run out of FP right away anyway, it's useful, sure, but continuously isn't always best when I'm in souls for instance.
I don't think the way WW is now is really great, I'm not only talking about the dev cost, the randomness of the skill duration is a little silly imho. If that was cut down, and the duration upped just a little bit, I think it would be fine.
