They toyed around with those ideas, Smash_Brother. When you duck and take an attack, it has much less of an effect on your character. With someone like Bowser, he really does shrug it off. The problem was that there wasn't much you could do while ducking to make it work. For most characters, eventually this would cause them to fly away horizontally, without any real height upon high damage and heavy hit, but this technique works very well for Bowser in the higher damage ranges. With good timing, a solid Bowser player can take great advantage of this, though so few player as Bowser to start with, so most, if any, use it in lower percentages for other characters, opting not to get hit at all, anyways.
Now players can crawl, so perhaps they took this to another level allowing crawling and attacking to work much better for characters in Bowser's line.