For reference, health insurance + care insurance is super expensive in Germany already (compared to most European countries) and both insurances are mandatory and generally combined. But the system is also super inefficient so a lot of the money is simply wasted on bureaucratic nonsense, making insurers rich, pointless referrals between "specialists" to make them rich, etc. The system actively stimulates waste, if you are privately insured, you get preferential treatment. Which means that if you aren't you get treated like dirt. I've been both private and public insured. I've experienced both.
My own country the Netherlands got rid of the private/public distinction. Everybody is insured via a private insurer. They can't reject patients and patients are allowed to switch insurer up to once a year. Insurers also work with health care providers to make sure money is spent more efficiently. Meaning hospitals can't just offload their inefficiencies onto insurers. And insurers can't just offload that onto patients. Because the patients switch to the insurers with the best relation ships with healthcare providers and the best deal. They all have to provide the same base coverage but you can insure for stuff on top of that.
The Dutch system also has its flaws and deficiencies. But my parents together pay much less than me by myself in Germany. And as far as I can see from their recent experiences, they are well looked after. It seems the Dutch system has a lot less bureaucratic nonsense, better information sharing, more modern hospitals, etc. It also has underpaid nurses, issues with some types of medication not getting covered, and a few other issues. But compared to the expensive German mess; much better.
Germany is mainly legislating to kick the can down the road instead of addressing any of it's structural economic issues: a government bureaucracy that stifles innovation rather than promoting it, a pension system that is essentially a underfunded slow moving train wreck at this point, broken physical and energy infrastructure that will take decades to fix, and a hopelessly inefficient health care system.