A vague complaint or an unstated wish leaves room for the other person to distort, minimize, or genuinely misunderstand what's actually being asked — whether deliberately or not. A specific, direct, enforceable request closes that gap immediately: it either gets a clear yes, a clear no, or a response that itself reveals resistance, none of which a vague complaint reliably produces.
This isn't primarily a communication-style tip — it's a diagnostic tool. George Simon's clinical observation is that the shift from vague to specific often does double duty: it makes the actual need clear, and it exposes, faster than any amount of vague back-and-forth, whether the other person is actually willing to meet it.