I know that we are not able to search in comments, but why? Is this a technical problem? Is this only a lack of funcionality of the software?
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More of a philosophical problem. I think Jeff has said somewhere that comments aren't considered content per se, and that they shouldn't be considered part of the permanent, canonical question/answer. As such, he probably doesn't think there's much value in searching them (if there's anything important there, it should be in the question or answer!).
It's a feature that has not been enabled in (or even written into) the software.