I don't think so. Many CEOs are irrational dunces and would react negatively if you admitted any flaws in the product or in yourself or anything of that nature

I don't think so. Many CEOs are irrational dunces and would react negatively if you admitted any flaws in the product or in yourself or anything of that nature. However, I don't think that as such makes it unprofessional. I think it's just common sense (which I'm aware is not so common).