Ya, I'm guessing you would actually get better care in a country like Thailand, the Phillippinnes, India, or China. It might make more sense to retire in a LCOL place with good affordable healthcare rather than rely on Medicare. Heck, just get a good policy with evac to the USA if anything major happens you can't handle out of pocket (and at that point, it is probably cancer or something anyways). As I get older, it becomes more appealing to consider.
I had private insurance in China and it was wonderful. I could get an appointment quickly for whatever, the waiting room was really plushy, the deductibles were like 100-400 kuai, mostly the former. The biggest problem is that private insurance in China has a payout limit (around $100k/year for the policy Microsoft gave me)...which...well...whatever.