[Kaimetsu]

You could catch my leg as it flew towards your knee in a time span of about half a second? I doubt it. If I was stupid enough to go chest height then maybe, but I'm not. You'd have a shattered knee in no time.

A blade in the shoes might work, but it couldn't be a very big blade or it'd get very clumsy. So you wouldn't be doing so much damage with it unless you hit face height, which is risky. On the other hand, using your feet as blunt weapons allows you to break bones, which would do far more damage.