I am not buying this perception as fact myself OP. I have never ever seen a poster decide on here or anywhere online or on real life that they will leave husband/ family/go NC tomorrow because x said so.
We also have to debate our definition of ' good ' and what this means. The definition of good in the 1950s is not going to be the same as our definition today. We know so much more now, as women especially. We have access to information and opportunities in a different way that allow us to grow beyond the 1950s perception of say what a ' good' marriage tangibly involves.
I can agree with the sentiment that LTB just isn't as simple, easy or applicable in so many cases I see on here. There are many complexities to why LTB might not be ideal at a given time, even in the face of pretty crap behaviour.
My feeling is that we now have much better language, descriptions and means of discussing and sharing experiences of human behaviours that are not ' good' but we have been endlessly bloody programmed, as women especially, to believe is ' good'. We are systematically brainwashed to believe and accept that we are not good if we don't do significantly amounts of things on our role as women, wives and mothers.
Not on your god damn fucking life would I ever enter into a relationship at my age with a male. Why? Because in my understanding now of women, men, society and pervasive drives, women are always disadvantaged. No to that thank you. Therefore, there's no such thing as a' good' relationship in that sense because a woman would always have to accept a vulnerable position. Unless - there are no children, no financial reliance, no family expectations, no societal expectation ( e.g women are csrers, nurturers, must provide sex).
Ones definition of good is not another's.
My current definition of good in terms of any relationship is only that with myself and limited bursts of minimal interactions with other humans.
Never have I ever encountered anyone going no contact with family without absolutely agonizing and endless abuse in some form, often hidden, for years. You'll never provide proof to validate your perception as none of us have full details of what's going on in the entirety of one's relationship with others.