Does it matter? How many dance forms have you never heard of because it wasn't on TV, or you weren't looking at the time it was. Do you think that not knowing about it is a big loss? Do you think that dancers on dancemonks.org discuss this? ;-)
I don't know much about hairdressing, law cases, making play-dooh, or the sex life of dung beetles. I don't blame TV for never mentioning it. Nor do I think it's a big loss for my life. (It could very well be a big loss - but don't tell me. If I don't know, I won't feel sad).