> So, in your entire career, you've always worked in companies where you were a subject matter expert on everything the company did? Always knew the business domain inside out? You were running the numbers, sitting with customers, and determining yourself what they really wanted?

You don't have to be the only person involved in the requirements for you to be involved. So yes, I've been involved from my very first internship where I pitched a new product to the CEO in my second month on the job and got told to go make that happen.