Part of the problem is the blood supply. The FDA limitations on donations are a bit excessive. They could expand the heart rate, blood pressure, and hemoglobin limits a bit and let people who have healthy blood, but are donating for a medical purpose (i.e. people with hemochromatosis or polycythemia vera) donate and/or without a prescription and more often than a normal person given the high rbc.

But they rather let people die, because muh fda said so. 🤷♂️