Kaiser is above average in the US, but in the major cities on the East coast you can actually find care that is much more sophisticated than you will get at Kaiser. If I were dying of a rare and aggressive form of cancer right now, I would rather be in Florida (Mayo), New York (Mount Sinai and Sloan Kettering), Boston (Dana-Farber), or DC (Johns Hopkins) than California. Kaiser's big advantage is the whole-life aspect of care, which is pretty appealing as a healthy person, but the medicine available in the US gets much more complicated.
If you live in an area served by Kaiser and don’t have a very specific health reason to choose a different provider, I highly recommend them. They might not be able to treat that rare and aggressive cancer as well as the Mayo Clinic, but because it’s whole-life care, you’re more likely to find the cancer early.
Edit: Question. Can Mayo expand to cover everyone in Florida? Or is their advantage in hiring the best of the best? What makes their model better than Kaiser?
I agree with you that the Kaiser model is very successful and has great outcomes at relatively lower cost. I was just pointing out that if you want to show off the complexity of US Healthcare, Kaiser isn't the best model.