The bravado can be useful, particularly if you've encountered CEOs/Presidents/Etc that are personable in speaking, but may not automatically relate to the purchasing portion of the business; it can help to reflect on the ways what you offer is of key concern, and to let this matching of interests frame your points - and your persistence.
The typecasting veers a little extreme, particularly in an era that's seen its share of technocrats. Integrating this and "Strategic Selling" is more than a little interesting.
Take away point is to not shy away. In terms of not covering your bases - that would not be wise, either.