At least "Samantha" waited until the children have grown. God pity the wives whose husband trooned out when they were preganant or have just given birth.
Idk, it's hard work for the wife, but at least when he troons out because...hes jealous of the attention the ife/baby get, he gets some kind of sexual urge from his own babies, or whatever disgusting incidence it is that seems to tip their fetish into action, around baby time:
If he does it then, it's tough but the wife can leave, not invest 20 years into this person, not have lives irreparably interwoven, and not traumatise adult children. Just leave, let him live his troon life. He won't be putting any interest in to try to see the baby. He'd be happy to dead-beat dad it, while he pursues the fetish.
After all, trooning out is a lot of work!*
Then you can rebuild, comparatively young and with child unscathed.
*just thought actually - as well as the fetishistic elements that he's into, on display right up close, that probably tips the scales for men tending to troon out when wives are pre/postnatal; it's probably also that they see this new life, this new expression of their genes, and think this is my chance too, I can start it all again and build the perfect thing form the ground up.
-Despite the fact that truly, they are essentially disappearing personhood into fetish it's like end stage dopamine dependance, where the desire to co and achieve that buzz just takes over like a parasite eventually overcoming it's host entirely.