So, now that you’ve impugned my motives, let’s talk about pre-existing conditions. A large voluntary association would work just like healthcare through the workplace. They would negotiate with insurance companies and other providers to get the lowest rates for ALL members, unlike authoritarian government care that decides who gets or doesn’t get care through denial of services or queuing.That would also be a form of single-payer. When you get sick, the government could give you a voucher to cover any reasonable cost for your treatment. You could take that voucher to the doctor of your choice and get treated. But that is probably not what you meant, is it? You were thinking the voucher would only be enough to cover the premiums for the average person in reasonably good health. You were probably not thinking about a voucher that would be sufficient to get someone care who has a pre-existing condition and whom no one would willingly insure for the cost of that voucher.
The problem of the individual market, made dramatically worse by ACA, is that it is individual.