Is part of a Designers role is to say "I Don't Know"?

Yo: You need to teach me how to pitch, “I don’t know, but let’s find out.” Every time I’ve used that, the exec team said, “Well then, we don’t have the budget for that kind of research.”

That makes me think of something I feel about life. Procrastination and delay is a key ability in success. Sometimes, we just need to buy more time. Instead of saying, “I don’t know.”, I say, “You know what, I have something back at my desk that I think would work. Let me bring it tomorrow/next week/next month.”

Sales works the opposite way;)