But now we have a virus that goes around in huge waves. In the last wave around 40% of the Dutch and 60% of the Danish population is estimated to have become infected. There are around 5 waves per year.
For flu, there is one wave per year, meaning that vulnerable people can live their lives fairly normally for the rest of the year.
Clearly these vulnerable are not needed in the workforce either, because we do not want to do anything to protect them.