#2, about health insurance, overlooks a big part of the RAND HIE's findings: people who were sick and poor in the study did have worse health outcomes.
Due to higher taxation, low-income individuals would have even less access to medicine than today. Keeping people away from drugs with prohibitive taxation means starving entire demographics of this component of health care.
So sure, people who have the funds to take excessive amounts of medicine may be "just as healthy." Others would be considerably worse off.