The problem is that with a few notable exceptions (eg. colon cancer screening) there is little or no evidence that mass population screening for the presence of disease that is already established increases longevity. (There is an abundance of evidence that preventive behavior to avoid disease in the first place is likely to increase longevity.)
Your missing the point of the early screening..
They want to catch the issues early so they can “adjust” the expenditures on them.
Your test results are in. You have cancer. Here is your bottle of pain pills. Now, go over there and die. NEXT!