CCBS is my primary MOCing system, as it has the larger parts I like to use. So, for all those who are old system enthusiasts, I hope you don't find me.
CCBS is what has forged my memory of Bionicle. It is versitile, accepting of new pieces because of it's "blank slate"-aesthetic. With the old sets, I would take them apart, hoping to create something new. It didn't invite me to MOC. CCBS, on the other hand, coaxes me to fix that small nick in the armor. It appears as an easily customizable system, which for some, means they use that system as their primary MOC platform, so to speak.