One reason is because, operational experience or not, VC partners all sit on the boards of companies, most of which fail, and so have a front-row seat for their implosions.
I still have my doubts about how much the gain from that experience, that will lend value to any specific future potential investment, unless the firm that failed was in a very similar business. And you also have to consider that VCs frequently sit on multiple boards, and have routine "vc firm dealflow" stuff to deal with, so their attention gets spread around a lot.
Anyway, I don't mean to say that they don't have anything of value to add. But I will stand by saying "you claiming to be an expert in my business is a red-flag", barring some specific evidence to the contrary.
