You offer two examples of value:

1. Fund and drive vaccine development

2. Purchase large quantities

Neither of those is what I want from my insurance company. How much are those two things costing me? If my taxes just went up $100/year for the next 3 years to pay for that vaccine, that maybe wasn't ideal. If my taxes went up $10 total, that was an awesome deal. If I have no idea how much that vaccine cost me, and nobody else seems to have a way to figure it out, that's really bad. One of my biggest complaints about health insurance in general is the lack of transparency. If government control reduces transparency, that would be bad.