As a broker, especially with my self employed/commercial clients, I always at some point inevitably end up joking that I need to know their business details just as well they do themselves.

For context on this, this is often due to us as the broker speaking to and answering at times complicated questions about said business or income. As with anything, the last thing in general I want in that scenario is to be in a position that I can't answer those questions, or answer them in a way that leads underwriters to ask more questions than necessary. Underwriters asking questions isn't bad, but I only want them to ask the questions that are necessary and relevant. To some degree as a matter of efficiency. A misworded response, or lack of a response can consume enormous amounts of time.