I think the point is that not all cases are cut and dry. There are many for which evidence is inconclusive; and for those having a blanket regulation is worse than letting the patient and the doctor select a choice that the patient prefers.
Then they chose a poor example to illustrate their point, since anyone is free to book a cancer screening even if they are younger than the recommended age, if they so prefer.
You can try and book anything you like, but the doctor/technologist is under no obligation to actually run the screening test for you, and if they do there is not requirement that your insurance pay for it. So you can have a full body MRI reference done, but it will cost many k$ out of pocket, if you can get someone to do it for you.
