You can select an insurance policy with rationing and a $10M lifetime benefit, and I can select an insurance policy without rationing but with a flat $1M lifetime benefit. The system we have now is not free because governments dictate what kind of policies medical insurers can offer, preventing consumers from making many of these types of choices.
When we decide that one size fits all, then the only choice is to have politicians and bureaucrats making these decisions for everyone.
When you make a decision about what your life is worth, that seems morally sane. When someone else makes a decision about how much your life is worth, that seems morally objectionable. Only free markets allow us to mostly avoid the latter choice.