i remember hearing, that their argument was, that a strong profit-incentive would motive the manufacturer to increase production as well as quality. I also remember that the debate around that topic was drowned out by some weirder theories. E.g. during that time q-anon was on the rise, and some people argued, that the gates foundation was using covid to implant microchips into people or something like that
source: my memory from a couple years back