[stcredzero]

Can you give more specific details about how it helps you/the team?

The marketer needs to have enough of an idea of how the product works to be able to talk about it intelligently. "Enough of an idea," means one needs to know what the relevant parts are, and how they interact.

Imagine you are a contractor putting in a kitchen for someone, and they sometimes refer to the sink of the island and the sink on the rear counter as if they were the same thing. I wouldn't know which one they're talking about and it would drive me mad. Marketers make mistakes of this magnitude all the time.