They simply have no place in collaborations. In collaborations, clarification drives the discussion. If participants are not talking about the same thing, but believe they are, confusion and misunderstanding abound. During the early stages of problem solving, collaborators need to phrase the problem, essentially, as a non-attack question. Beyond the attack, they lead to argument and defense.
People choose sides and defend positions.
All these questions could lead to the same, single answer. Yet, just as easily, they could lead to widely different answers. Until the question is shaped and refined, collaborators need to delay their natural tendency to propose solutions. Yet, they are not the only questions that need to be asked. The words within the defined problem demand definition.