While I agree that to deal effectively with some specific thing, it helps a great deal to have seen it before, it doesn’t follow that one needs to do that specific thing ourselves in our own training. For example, I don’t need to train thai kicks or spinning heel kicks or even bolo punches myself to deal with them effectively. And, in fact, doing that (training those things), if I don’t intend to actually use them, will be at the very least a waste of training time (which I could put to better use) and at the worst counterproductive to training those things that I want to do. If one wants to train against something specific, it’s much better to actually face someone skilled in that thing/approach/art than mimic it – usually poorly – ourselves.
I’m all for crosstraining, but there is a huge difference between what I call “combining various arts” and “covering your bases.” Some people just train different things without any longterm goal or plan, with no “coherent picture” in mind. The problem is the habits and priorities taught in art #1 will often contradict art #2. They overlap in that each art addresses the same problems, ranges, situations, aspects but each has its own specific ways of moving, standing, punching, kicking, etc. To do one “correctly” is to do the other “incorrectly.” Now you’re training two incompatible things. That’s not a recipe for success.
Instead, by using a “covering your bases” approach, you realize that there are common situations or aspects in fighting, and that there are certain needs or requisites that you must have covered to fight effectively (you find this very quickly when you fight). Much of it has to do with range but some of it with approach. When you find some aspect that is not covered in your art or approach, then you “cover that base” by finding some answer, some art for example, that deals with that aspect without any overlapping or dissonance between the two arts and you train that. If there is some overlap, you’ll need to set choices and priorities to suit you. Then, after covering your bases, you need to find ways to connect these various arts – how they can fit together, facilitate one another, etc. Now you have an individualized, coherent fighitng method where all your bases are covered.
There are reasons the WCK approach does not favor high kicks, including that they are incompatible with our principal method (the use of our other tools): when you use them they take us out of our game, just like a bolo punch does (until we “recover”). In my view, WCK is not a “kickboxing style” or approach, just as it isn’t a groundfighting style or approach, and to try and use our tools in kickboxing or in groundfighting while it may work (and I know some that have made it work), particularly against the not-very-skilled, we won’t get the full benefit of our tools/method that way. If someone wants to kickbox, there are better methods than WCK for developing good kickboxing (which explains why none of the world’s really good kickboxers practice WCK).
So while I have no problem with folks “adding” an outside game onto their WCK, I think how it is done, what things are adopted, needs to be approached with caution since those additions can easily compromise their WCK approach. Moreover, when we “add” something onto our WCK, we should call it what it is and not call it WCK.