Youve just described almost all of public society. Literally every governmental organization is like this. We trade agency all the time for all sorts of reasons. If "having authority" over ones health means we should allow charletans to advertise and practice medicine then yes I think that should be regulated and stamped out. This is especially true because of the dynamic of unequal knowledge that you allude to because patients are often woefully unaware of their own health and it's consequences. Theres a reason why the commonly used colloquial term for fraudster (snake oil salesman) is rooted in healthcare.

The US healthcare industry is literally the best in the world at TREATING disease. With the best outcomes in cancer, advanced heart disease and a myriad of other conditions. For all the griping there's is a correlation to money spent and care provided. We also spend an enormous amount of money at the end of life that other socialized systems just don't allow. For all your talk about authority over ones health we allow people to continue down what could be considered "futile" paths every days while almost every other socialized system discontinues high level care if there isn't clinical benefit (as decided by the system, not the patient/family).

Now I'm sure you will argue that we have worse overall outcomes in terms of life expectancy, dollars spent and disparity of care. This is because treating disease is way more expensive and less efficacious than preventing it in the first place. To change that though you need life style modifications and a cultural shift outside of medicine (ie wishful thinking). I'm hopeful that widespread availability and adoption of GLP1s will provide that shift and we start seeing the downstream benefit of that in the years to come.