I'm the one who started this because some friends wondered why they should learn technique. Ironically, they decided to take the class despite their early reluctance and we're all benefiting from it.
I believe if you're learning any skill you should try and do the best you can. I definitely feel that way in dance. I think some people are very comfortable being comfortable. It's hard pushing yourself, feeling awkward or even stupid. They may feel all they want is to have fun socially with their partner so why get stressed out? It can be viewed as accepting your limitations and going with the flow. Sometimes, that's fine. But to me, the only way I can improve, and be the type of partner others may want to dance with, is to do the hard, even boring work and improve. That won't happen without learning better technique.