Patch: Tespia 1.2.190

That's not correct, Bucs -can- choose to use a combination of Shockwave + timed Demolition to avoid all attacks, I tried it, and it worked very good. And I forgot to mention that they also have Barrage that will give them some more timed godmode skills. Really you should try it sometime, Demolition/Barrage/Bstep can be use almost the same way to avoid attacks.

Wrong, wrong, wrong.

Shockwave does not have invincible frames. Furthermore, I tend to get bi'tchslapped by a monster more when I use Demo over Barrage. You want broken? Combine Barrage with Corkscrew Blow. If done correctly it's perma-godmode.
Stop whining.