You are mistaken, The ACA is not an example of socialized medicine. THe VA is an example of socialized medicine, and a not particularly good example from what I hear! We have many examples of far more socialized medical care systems than the ACA.
The U.S. healthcare system is
by far the worst in the world among all industrialized nations in terms of cost and outcomes. The ACA, as originally proposed, would have been a great improvement, but still bad. After the Republicans destroyed it, to the extent the courts would allow, it is even worse, but, nevertheless, less terrible than what preceded it.
There is no satisfactory, totally capitalist medical care system possible. Medical care can not satisfy the fundamental requirements for a "free-market." Of all industrialized nations, Switzerland's medical care system comes as close as possible to a capitalist healthcare system that works. U.S. costs are only twice Switzerland's, but of course Switzerland's care and outcomes are better. The Swiss succeed because of general homogeneity among citizens, though they speak four languages, and extremely rigid regulation of Swiss insurance companies by canton.. The U.S. continues to attempt to create a hybrid market in medical care resulting in the young and healthy being the wards of the for-profit capitalist market and the old, sick and dying the wards of the government.
The U.S. approach will always be horribly inefficient and a dismal failure. It will never be fixed so long as we continue to deny the obvious. We will continue to introduce changes, each change making the system a little more complex, a little more expensive and inefficient, a little less effective, and a tiny bit less terrible... Most younger people have no clue about U.S. medical care and how truly dismal it is, because they have very few encounters with it..
Anyone familiar with the U.S. approach to medical care who continues to insist that the private sector can always do things better and more efficient than government should seek psychiatric help.