LFJ: your story about WSL using a knee to the head when it fit WC principles is a great example of divergent thinking.
Now regarding throws, there are times when the huen bo or circle steps from Biu Tze and the yap ghurk or inserting step from the dummy so displace your opponent's center that he will be literally knocked over as a "by product" of basic stance and steps. In such circumstances a throw is often a natural and efficient follow up. Sort of like that knee to the head. Or, since your opponent's structure and balance is so compromised, you might just prefer to punch the heck out of him. Either way fits my definition of WC.