The way things are described make the doctors sound powerless. I've been frustrated by the lack the information on the usefulness of hospitals. The impression I've gotten is that they cannot do much, and if they would go as far as intubation, you're highly likely to die even with intubation.
We can’t however cure the virus. And if it progresses far enough then no amount of oxygen will save a patient. These cases are hard because we have to watch someone die without any means to save them. Doing cpr on a patient with covid can feel pointless. If the lungs do work then no amount of chest compressions, oxygen, and cardiac drugs will save that person.