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Does having four competitive styles dilute the quality of the dancing in each particular style, as compared to having only two competitive styles?
I think yes, even at the high levels. I've known a number of professionals who chose their style based on the "competition" of that style's field, or the style that highlighted their strengths and masked their flaws. I'm not at all saying this is wrong to do. It is, after all, competition. But it does mean that people can somewhat "hide" behind their chosen style rather than tackle their weaknesses. It also means the total pool of competitors is more scattered.
Personally, I thinkt he bigger problem is that so many dancers in US come to it later in life. We don't have the clubs, support system, etc, to be starting people out in the sport as kids.
IAWTC. To get the equivalent of "Olympic" quality, you have to start them young, or you have to get someone young-ER, who has unlimited money and time to devote to it. Eliminating the two American styles would just put off the older students who might not start with competition in mind.
meh, i think the 4 styles complement each other. *shrug*
That is a very cool way to look at it.