Here's why I like single payer. One would think you'd like it too, since you've listed a variety of health issues. Is it socialist? Yes, but in the European/Canadian mode. People are living longer, but they're also having to work longer to keep medical coverage. Everyone is complaining that there are "no jobs" for college graduates, but there are literally millions who could and would retire if there was single-payer healthcare available, opening-up those jobs and presumably the economy. In a country as prosperous as ours, we probably have the right to demand good healthcare with the expectation of a long life.
Our current for-profit system incentivizes unnecessary testing to pad profits, and doctors have to jack-up their bills so they can afford malpractice insurance. Insurance companies still make obscene profits, including United HealthCare, which for years paid it's CEO an outrageous salary and compensated it's top execs well over the norm. I have Canadian relatives and a Canadian MD in the family, and they're mostly satisfied. The MD has his practice "capped", which I see as a problem because once he hits a certain dollar figure, he is done for the year.