This seems a little extreme. A lot of discussions are too abstract to bother prefacing with "this is not my actual view". I don't think it should be called lyin

This seems a little extreme. A lot of discussions are too abstract to bother prefacing with "this is not my actual view". I don't think it should be called lying if my own opinion is not very relevant, or the thing being discussed. A lot of the time this can take the shape of "have you considered...?" or "what if...?", so there is a built in hypothetical.