I don't think anybody on this forum recommends using CC. Even the long-time users admit it's a bit of a wreck, and C2 is a better bet for new users. Officially we've also retired it and strongly recommend no new users start using it; we are leaving it there only for users who have long-term projects that they want to finish in CC.
I think the main reason is just inertia. CC was first released in 2007, and over a period of several years gained fairly widespread recognition. C2 has been around about 2 years, but up until a year ago (or less) it was still missing significant features that CC had. I think we've pretty well caught up by now, but those who were familiar with CC aren't yet properly aware of the progress C2 has made, so still discuss CC. I really wish they wouldn't - C2 is better in almost every way, and I worry that anyone new taking up CC will be disillusioned by a much poorer quality product than we now offer with C2.