"But framing it as a “myth [of] perfect attention and treatment” sounds a bit like delegitimizing the entire healthcare industry in a way that makes me raise my eyebrow."

It doesn't delegitimize the whole industry. It points out real problems. A lot of patients are not given enough attention and don't get the correct treatment because the doctors didn't listen but rushed through things.

I was criticizing the rhetoric, not the sentiment. I’m skeptical of an argument when it flies too close to what I associate with irrationality and pseudoscience, especially considering what’s happened in medicine over the past 5 years.

The “myth [of] perfect attention and treatment” is an easy strawman for grifters and conmen to take advantage of: see RFK Jr.