But the attitude needs to be "let's put the requirements on the table and see what we can do" instead of "you don't get what you want unless you give me a good reason". The latter comes from an angle of distrust which I'm arguing against. The former comes from an angle of collaborative problem solving.
In a company in which I go to a team relevant to a project and like to engage in a discussion and am met with an attitude of "unless you give us a good reason we'll stop talking to you", the atmosphere is not one that will keep me personally for long. YMMV.
> I believe you are intentionally misunderstanding.
You are free to believe what you like. Opening a reply with such a sentence is pretty sad though. It does not foster a healthy atmosphere, nor does it match reality, I might add.