Search engines care about how relevant you are. Period. Maybe a couple years ago I would say put everything seperate but it doesnt hurt at all having your stuff relatively closely knit to each other. Relevance is what is important.
there are many benefits from having stuff separated but it has nothing to do with c-classes themselves or even a-classes for that matter. Those benefits are dependent on your business model.
if that was the case then all free blog services would have peoples sites listed page 10+ on serps.
Now if you are doing something blackhat or suspicious.. then yeah separate classes are needed so you don't lose everything at once but then you have to ask yourself different questions...
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