Are you asking if early detection of cancer results in better outcomes? Yes, the data unequivocally supports that diagnosing cancer before it spreads leads to lower mortality.
I can see that in the general case, it can lead to increased spending and worse outcomes.
Yea you can get prenuvo or a psa test by paying out of pocket. No one is holding anything back from anyone. I got a PSA test out of pocket for $60 at quest ( family history of PC) .