In a perfect world, a healthcare plan should pay for cancer treatments or crucial medical procedures. In the United States, I'm not sure this is a guarantee[0][1]. Going without healthcare seems to be the riskier gamble, but it's a gamble either way.
[0]: https://www.startribune.com/unitedhealthcare-part-of-95m-set...
[1]: https://www.propublica.org/article/unitedhealth-healthcare-i...
It's amazing that Americans are so brow beaten that even in a "perfect world" they still require a "healthcare plan"