I disagree; I've been involved in products whose sales involve the sizes of TCAMs on a Cat6K and the particulars of BGP regex filters, and while it was vital to have someone who could address those questions involved in the sale, and while the decision on the sale was being made by people who know what those things mean, it was pure sales execution that turned the engagement from a science project to a "nice to have" to a "must have" to a purchase order.