I don't think either of the perspectives are right or wrong. FD- your response is about the legal aspect of separation and divorce, and it is spot on.
Mine is from growing up with my BPD mother making threats she didn't follow through on and the times I acted on them, or believed them, and felt like I fell into the "reaction" pit she intended them to be. The divorce threats weren't specific to me but they were threats that she didn't act on.
Some threats were real but they were more like the impulsive ones. To get a separation/divorce means making a plan and acting on it- consuting a lawyer, getting papers together. If what she wanted was a quicker emotional reaction, this wouldn't work. It might happen if someone seriously pursues it.
However it is always good to be informed about the process and any pittfalls should that ever happen, for either spouse. It's true that one can't predict how any one relationship will proceed.



