No prototyping 2 !!!

Just got the feedback from Edward and I would like to clarify something about no prototyping. Actually, what I suggest is to use other tools (use case, data flow, etc..) to let the user to think in a deeper way to gather the better requirement. Prototyping is also a tools but I would suggest to gather the requirements from different aspect before using prototyping. However, this lead to the user need to take more responsibility and more effort during the design phase. But how to persuade the user to take more responsibility? This is related to the environmental factor and your company culture and it is another issues...