Medicare advantage is not government Medicare. People should avoid these plans which look good up front but provide less at their core.
With "Advantage" plans, the insurer decides if you get treatment. So if you have cancer and are 85, they could say it is not cost-effective to treat you, go die. Kind of like what the original Obamacare was about with Dr. Ezekiel Emmanuel. Death panels doing economics analysis.
Get supplementary medicare insurance where you and the doctor make the decision on treatment, not an economist.