The problem with arguing Silat is that there are so many damn styles out there, its a very, very hard art to trace. There are two components to learning Silat: the dance and the martial art itself. Most traditional Silat places will teach you the dance first, which includes inefficient and/or slappy techniques, then they learn the real martial arts behind the dance. The problem with this is that most students still have some of the bad habits they picked up from learning the dance first, which is why my Sifu teaches us the martial arts first (actually, at this point I have no idea if I will learn the dance or not, which I am just fine with).
There is no mysticism in the Silat art I practice. At all. I don't know what type of Silat I practice, but I will ask next time I get the chance. When we drill the person we are practicing with starts slow and compliant, then speeds up as to make the technique more practical. Unfortunately I'm still only a couple months in, so I don't have an intimate knowledge of the techniques, but maybe in a couple months I'll post up some videos trying them on friends who aren't in my class.
As for the idea of street vs sport martial arts... there is a difference in my opinion. But it has nothing to do with ki/chi/qi, it has nothing to do with some special training method that avoids aliveness, it has nothing to do with d3ad1y super moves... it is simply attacking areas not allowed in competition, like the throat of back of the head. A huge difference between the two? No, just areas you can attack; thats my two cents anyway.