It's funny, cause I just remarked the same thing a couple of days ago. I received my S back from service and for some reason I looked inside the black case in more detail and noticed that the "fluf" is not as thick. So it looks like this is just the way it is. I don't think it would make a big difference for scratch protection though, since most if not all scratches are caused by the two headphones making contact with each other, not with the case. I did not get the 2 slot nylon pouch that all CA IEMs come in now back when I purchased mine (OG and S) so I've been using a microfiber cloth (the kind you use to keep your glasses clean) to wrap and separate the L and R shells so that they don't bang or scrape against each other. It's been very effective. But with the S it's not feasible to expect to prevent all scratches, they're just too polished and the metal is too soft.