Aderyn7 you say I am also really depressed by this thread and the way society endorses men just opting out or viewing their having to work the next day as more important than physically caring for their sick DC.
Let's apply what you say to separated parents.
It means that the NRP, usually the father, can never turn off his phone; never go to a theatre; never take the new family which he might have out; never have a drink in case he is needed and has to drive.
He obviously cannot go abroad.
In fact he must remain living near the mother, and cannot move away for the sake of his career, or his new OH's career, or to be near his or her ageing parents, or just because he or she prefers another part of the country.
And if the mother moves away for the sake of her career, or her new OH's career, or to be near her or his ageing parents, or just because she or he prefers another part of the country - must he move nearby at the cost of his career and his new relationship?
It doesn't work, does it?