Profit margins are to keep a company out of debt and ensure it can grow as technology advances. Government would still need to pay employees and keep up with tech. But your right, government does need to avoid debt because it can just print money but that leads to inflation. There is no way to make cost just disappear.
Private health insurance still has a “profit margin” that boards are legally bound to. The public system removes that line item.
Profit margins are to keep a company out of debt and ensure it can grow as technology advances. Government would still need to pay employees and keep up with tech. But your right, government does need to avoid debt because it can just print money but that leads to inflation. There is no way to make cost just disappear.