The moving out part is Penny Tuppy's position. I don't agree on it either.
Her reasoning is the detachment being so complete on the WS they will be under intense pressure, not to mention this heightens exposure if you have to leave your home.. its not something you can easily hide.
I am divided about it. Her position is it is counter-intuitive, but it does work in practice.
I believe you are suggesting remaining in the marital home out of priniple, not out of any strategic reasoning. Penny is pure strategy.