Proposals require input. Writer's can't write without it. But you're not going to get the input you need simply by asking open ended questions. It's hard to prove a point if you don't know what points you're trying to prove. You have to ask specific questions that address what you need to know when you are writing.
So all those questions you have, like "should you emphasize this benefit or that benefit?" or "what would the customer prefer?" need to get asked.
We're building a whole lis