South Korea may become the first country to disappear from the face of Earth

It completely removes a widespread counterbalance to inter-population competition for the same jobs/roles, and removes the disincentives to short term pleasure seeking for both genders (unwanted babies with associated costs).

Kids are really hard. Anyone who has seen someone raise them/had to be involved in raising them, is going to know that.

If you can have sex (aka fun), also part of relationships (also necessary for social health), without the costs (raising kids) - a lot of people are of course going to do that. The more people do that, the more competitive pressure there is to do that. A ‘race to the bottom’ in economic costs, essentially.

‘Steady state’ in economies is also that everyone has to compete at their jobs as hard as they can to do well. Though really it cycles between easier times and harder times.

Being pregnant is hard. And a healthy woman having sex regularly with a healthy man is going to be pregnant most of the time without outside intervention/birth control.

Raising kids is hard. And a woman who has had kids is going to be having to deal with/raise them, unless she can find someone else to do it.

But that is also expensive, because either the one person in the couple who doesn’t bear the direct physical costs of pregnancy (the man) is now bearing the indirect costs of it (childcare) which hurts his competitiveness economically against other men who are not, or there is a third person who is being paid, so the mother can work.

Impossible? Not necessarily. Depending on economic circumstances. But it can make things, to quote ‘hellish’ly hard.

Specialization has benefits. Also costs.

The movement is called "4B"[1].

[1] https://en.wikipedia.org/wiki/4B_movement