I hate to take the view of relativism in any subject, let alone magic, but I fear that its ugly head may have to rise here.
We are all individuals. We perform tricks, either our own or others, yet we all peform differently. We use different methods, different patter, different styles and different ideas. Why would the incorporation of XCM be any different? Some may use it others may not, surely it depends on our own gut feeling of how we want to peform and what we think the spectators might like to see peformed?
I hate taking this halfway viewpoint, but I believe it to be important in this case. Magic is an individual thing and whatever we choose to add to it only adds to our interpretation of what the trick ought to be like. XCM is no different matter. It's how we act that counts, not what we do. So by all means XCM if you feel it adds to the show. In many cases I could see why it wouldn't be necessary. A simple trick for a child wouldn't need XCM, it would be lost on them. Older generations may know that we have skill in sleight of hand, so showing it to them wouldn't tip any method.
So this lead to the view on real magic. Paul Harris covered this idea rather well in his coining of the usage of "astonishment". What we thought was real magic as a child is merely the unexplained wonderment that we invoke to explain what we can't make sense of. This wonderment is in fact equal to astonishment, be it as a child or to an adult. We are astonished by tricks that confound us. We realise we are being fooled, and that we may try and make sense of a method, but the fact remains that in that moment of time we were astonished. That is what I feel we magicians do. We astonish. The moment maybe brief, maybe drawn out, but it is a moment that we all strive for. In the end all adults are cynical/scientific (I could go on) to the degree that magic is not real. We know it is a trick. It doesn't stop us being astonished by something. Astonishment is the twin sister of Magic, if you will. I do believe however that this invokation of the true ideals of magic is doable. That we can reach a perfection of a trick in all aspects, whatever aspects it may be, that we go beyond astonishment. That for that split second in time we are torn from the physical world, and have no inclination of method. That moment of suspension of belief to create real magic. Something beyond real.
In many ways that is the scope of many mentalists, however they constrain their false explanations (if indeed false) to something real and believable-otherwise (obvious sentence alert) it would not be believable and would seem like nothing like a trick. I think that real magic is attainable in the eyes of many. We just have to search hard enough.
If any of you have seen Mr Houchin's control DVD, the spectators suspend their belief to the point where they see him dead. His pulse stops. Reality is bent, and the notion that it is merely a trick is gone.
This is not the only example of a trick that achieves this perfect moment, but merely one I think many would have seen.
So where does this leave XCM in this world of relativistic views, and lack of faith in magic? While it is indeed a portrayal of skill, an art in itself, the problem is that it brings the work back to reality. It displays that what we are about to see is an astonishing moment brought about by skill, not magic. And while this may suit many, whether through cards, money, minds, it doesn't satisfy me. XCM is merely another tool, one that may be needed to keep sharp, but one that doesn't change the gardener or the garden. You choose what you want to sculpt, what type of magician you want to be.
But for God's sake, strive for magic and nothing less.