Everyone is complaining about labor shortages because people aren't returning from parental leave

Parental leave is 1 year with pay, and lately, it's being partially expanded up to 1 year and 6 months.
However, an increasing number of people are going even beyond that, extending it up to 3 years without pay,
which is causing a huge outcry from the remaining staff who are struggling.
They are making a fuss with the HR team to hire more people,
but it's not like the headcount just suddenly drops overnight...
In companies where people have money and job security, many take long parental leaves like we do,
so I think that's why everyone is in an uproar over the labor shortage.ㅠ