I think this is silly, i mean after you ban GK, are you gonna ban IG, SW, BA as well? GK are really good but they aren't as bad as some of the top books from the past, and 6th may have some negative effectives on them that bring them more in line. Off the top of my head if you scored VPs for holding objectives per turn, and you couldn't be embarked when you it did it, alot of GK, and MSU lists would struggle.
Spamming does occur units like long fangs, and psy riflemen are good examples. In competitive play there really isn't any stigma, in casual play there is (even if what your spamming is bad). Having the models to do both is ideal (I tend to just count my grey hunters as blood claws it tones wolfs down fairly fast). That said talking to your opponents before the game really takes care of most of these problems more so if your willing to think outside the box and be flexible.





