I actually wrote a book about this very topic. You can find it in my signature. The short of it is that when you start to study bunkai, it changes your entire practice. The Korean's modified the forms without an understanding of bunkai. Often, if you want to make use of certain sequences, you need to go back to the source forms or it simply doesn't make sense. Or more simply, there are a few times where you could kick a standing opponent in the head. It's not enough to be portrayed as much as it is in TSD/TKD forms. In SD, head kicks are rare techniques. In a SD system, your forms should reflect this, otherwise you are dealing with techniques that are done merely for show.
