of course no! you can't hide behind your shield kinngrimm, deal with it, crushthrough is awesome for kicking turtle ass..
i imagined someone would bring up me carrying a shield. If it would be for that, i would have made this suggestion a long time ago, but i didn't i waited and while i waited i made out that there are several paradigmas to the game.
One mentioned was "rock paper scissor",
hide behind a shield counter would be in your mind chrushtrough?,
but they also crushtrough other blocks of polearms or 2h.
Also shields have a special counter which is called "shieldbreaker". If that doesnt satisfy you , then take comfort that in 3 of 4 last patches the higher tear shields got ballanced again and again and that not in their favour, if you are still not satisfied with shields well, this is not a thread about shields , is it now?
perhaps there should be seperate skills be in the character development one called "crushtrough" and one called "knockdown". Then only those who skill those can have that effect when they use a weapon capable of it. Invest more skill points, the % gets better.