Well, that is the point. Hey, I did not say dancing was a sin. And again, I wasn't referencing the dancing you listed. I'm church of Christ. My daughters were in ballet, tap, and jazz dancing. No big deal. But since slow close cheek to cheek dancing is called "dancing" I answered. The issue is engaging in activity that can lead to impure action...and the suggestion is to avoid such activity. It's called "playing it safe and not sorry".
FYI, I think the theolgy of the CoC is very similar to that of the Church of God (Anderson, IN), which I think is very solid, theologically. They've got a few little quirks, too; but very Biblical.