The problem is that when American employers grant to no sick leave to employees and are brutally against ever doing so, applying the flexible Swedish model to the US would be extremely hard. The model involves mutual trust and responsibility between the state, employers and employees and there's very little trust there in most other countries.
[1] https://www.businessinsider.com/coronavirus-sweden-no-lockdo...
[2] https://www.statista.com/statistics/545241/sweden-enterprise...