Personally, I have never been a fan of all-inclusive codec packages.
Neither have I. I was a vocal opponent of most of them for a long, long time. However, CCCP is
different. It is, by no means, an "all-inclusive" codec package. It doesn't try to be the be-all and end-all of codec packages, but to simply provide a well-supported, simple, and consistent install package that Just Works for most things. It doesn't do much that is "fancy" and doesn't include a bunch of badly supported stuff you'll never need.
Look through what is included in the
Advanced FAQ. I think you'd be hard-pressed to argue that anything they include is "damaging" or "dangerous". Even the very few things you could argue are unnecessary, say the Gabest MPV Decoder, they even configure certain filters to have low merit scores on purpose, so that they're only used as backups. About the only thing I disagree with in the CCCP Package is their choice of FLV Splitters (Gabest's old one rather than a more recent filter, such as Celtic_Druid's), but that is easily rectified.
Basically, in theory I agree with you. However, in practice, CCCP wins out. It "does no harm", is an easy way to get most people going without them having to learn all of the ins-and-outs of DirectShow, and makes support so much simpler.