Like Giovanni, I don’t live in America. Overall, our Australian health system works well. Here we get what services are necessary, without insurance. If you have insurance some treatments are pushed which are quite often unwarranted.
Sounds like your were similar ages to us when we had our children.
I paid insurance as a single girl, because my father did before me. When we married we decided against insurance. He is opposed to non-compulsory insurance. Everything went smoothly. We were covered by the Oz system of Medibank. We never earned enough money to pay, lived frugally offgrid etc.
I had a heart attack at 49, and got excellent treatment. My husband does not see a doctor, except to get his driver’s licence renewed.
In our old age, 77 and 82, we never do vax, eat healthy
In 2017, while working in Madagascar, I had a stroke. Treatment was appalling, and eventually air ambulanced to Mauritius. Treatment was good. Eventually I was well enough to fly business class to Australia. My husband had trouble accessing funds, but two of our chilren paid, and we paid them back later.
My daughter who was a nurse in a hospital told us the treatment of public patients is equal to or better than private (insured) patients.
That’s my 2c. for what it’s worth. Not that it will be terribly relevant to your Californian situation. Spend wisely, live healthy and hope for the best.