meh. spin kicks is pretty low skill cap stuff, this is why we see alot of "sparrers" to use it, since it's the easiest way to keep regain balance. i seen just a couple people who are able to maintain steady balance while standing on legs all the time even under heavy blows using only punches. but welp, it require much more skill and doesn't look "cool". same situation in aikido: have more people doing dms compared to people who execute clean throws. overall - nice explanation of what spar is.