I think a lot of it comes down to people's unconscious need to sound like they're listening without actually having to put in the effort. So they only scrape the surface of things, because we tend to absorb the mistaken impression that it's narcissistic to talk about oneself in more than the most vague and passing terms. (It may well be narcissistic, but I can't say I've ever made it a secret that I'm a bit of a narcissist myself.)

Dancing is fun! There's a point, I've found, where you don't even care if you're terrible at it (if in fact you are terrible), you're just doing it because you enjoy it.