Throughout these posts you seem to be linking no insurance with not wanting to pay for medical expenses. Why is this?
It seems to me that the person who does not want to have insurance and wants to pay for all his medical expenses, unless very wealthy, has desires that are incompatable. Anyone, at any time, may incur an enormous medical expense.
Although it is good to say "I will trust God and seek care as a last resort", this may cause the situation to be far worse than it might otherwise be in case of a stroke. Any delay in seeking care when there are symptoms of a stroke may leave a person dead, or alive with enormous long term costs. God's will may be for immediate help to be sought.
Some of the concern with insurance seems to be that the insurance company might pay for treatment(s) that might be immoral. Let's consider a hypothetical case. John and June Christian decide they should insure themselves and purchase private medical insurance at $400 per month each from Ajax Insurance. During their first month of being insured, their insurance company pays for what is termed a "medically necessary" abortion. An analysis of the cost of the abortion would reveal that the proportion of the cost paid for by each person insured by Ajax is $.25. Are John and June Christian guilty of sin because they each contributed, indirectly, 25 cents toward the cost of the abortion? Or is their sin a de minimus ("the law does not concern itself with trifles") infraction?
Let us say John and June are indeed guilty of sin in the matter. But wait, during the month the abortion was performed, John Christian had some medical tests performed along with his annual physical which cost the insurance company more than his $400 premium. He actually contributed nothing to the payment for the abortion so he did not sin but his wife did!
It might be argued that a person who purchases private insurance would be in a different category than a person who receives insurance from his employer. I think this is false reasoning. Employee insurance is a form of wages, and a person does not have to work for an employer who provides insurance. In my position before I retired, we estimated labor costs of projects by including the hourly wage, employee insurance, retirement benefits, social security, vacation pay, etc. all as part of the wage. Employee insurance isn't a gift from the employer, but an earned benefit.
I seek medical care whenever I think it wise to do so, and although I go to physicians I trust, I trust in God for my health. Regardless of what physicians may do, my health is ultimately in God's hands.