I don't doubt that this works well but there is a good reason that other hospitals are not using this approach. As the article mentions:
"This approach is not without risk, however. HFNCs blow air out, and convert the COVID-19 virus into a fine spray in the air. To protect themselves from the virus, staff must have proper personal protective equipment (PPE), negative pressure patient rooms, and anterooms, which are rooms in front of the patient rooms where staff can change in and out of their safety gear to avoid contaminating others."
"UChicago Medicine’s Emergency Department recently doubled its number of anterooms, thereby doubling its capacity to give ?high-flow nasal cannula to patients. The main hospital also added negative pressure rooms on two floors, making it safer and easier to take care of COVID-19 patients."
Not all hospitals have the ability to double the number of negative pressure rooms or even provide needed PPE to all caregivers.
A ventilator on the other hand allows for a HEPA filter in-line that prevents the spread of the disease within the hospital.
"This approach is not without risk, however. HFNCs blow air out, and convert the COVID-19 virus into a fine spray in the air. To protect themselves from the virus, staff must have proper personal protective equipment (PPE), negative pressure patient rooms, and anterooms, which are rooms in front of the patient rooms where staff can change in and out of their safety gear to avoid contaminating others."
"UChicago Medicine’s Emergency Department recently doubled its number of anterooms, thereby doubling its capacity to give ?high-flow nasal cannula to patients. The main hospital also added negative pressure rooms on two floors, making it safer and easier to take care of COVID-19 patients."
Not all hospitals have the ability to double the number of negative pressure rooms or even provide needed PPE to all caregivers.
A ventilator on the other hand allows for a HEPA filter in-line that prevents the spread of the disease within the hospital.