Actually this is not as easy as it sounds. Quite a few companies opt not to go into 'Kurzarbeit' because it means that you go under extra scrutiny as it is only there to stop major layoffs, which would cost our social insurance system even more. There is typically enough mechanisms to make it unattractive enough, that even unions accept unpaid leaves instead. IMHO there is bigger productivity problems. After COVID sick leave has massively increased. Many women do not work as much as they want because child care is still sketchy. There is often simply no incentive to work more because engineering careers are quite limited: general pay compared to expenses is really good, but top performers earn considerably less than in other countries.