The reason so many people sign up for Medicare Advantage is because of their constant advertising and telemarketing. Most people do not understand that traditional Medicare is a government program and Medicare Advantage is private insurance with all its pitfalls. I taught Social Welfare History to my college undergrads and graduate students, which required me to learn more about Social Security and Medicare than most people know. I am opposed to private insurance because it’s all about profit instead of patient care.
From Investopedia -
“ You will find that many plans unexpectedly won't cover certain expenses when you get sick—resulting in unforeseen out-of-pocket costs for you—and what they pay can differ depending upon your overall health.”
https://www.investopedia.com/articles/personal-finance/010816/pitfalls-medicare-advantage-plans.asp