I agree with you, but I think 180s not only end cheeseless tunnels, they also disrupt the spouse's thought pattern (or behavior). For example, if the WS wants to get a divorce, then the LBS can help the WS find information about getting a divorce (the process, the cost etc). Normally, the LBS is attempting to avoid any discussion of divorce, so doing the 180 throws the WS off-balance (the WS loves to be pursued).
Of course, we may both be saying the same thing and just using different terminology.
