After the world changed, Navi and Nalan still took care of their families to a certain degree.
But they refused to be controlled by them.
Four years in that world had already changed them to be completely different. They no longer needed family affection as much as they used to be when they hadn't had such long experience.
Yes, life is difficult.
But it was also much more comfortable.
Without anyone restraining them and forcing them to behave in a way that was beneficial for the family, the two of them experienced freedom. They could do whatever they wanted and carved their own future, far away from their hypocritical family members.
For both Nalan and Navi, their experience over the years was actually pretty good.
