The "Golden Rules" are not just plucked out of thin air.
They are based on multiple considerations, including the regulatory requirements to specify a design life for the product (see medical device regulations) and the current "state of the art". For example an X-ray system form 10-years ago will require a higher dose rate to get same image quality than a current system using considerably less dose can achieve. The images from an MRI scanner that is 15 years old are simply terrible by comparison to a current system, similar for a CT.
Given a growing number of medical devices are software based and network connected (Ethernet, Bluetooth, etc.), once the manufacturers support has ended (typically after 10-years) they will be vulnerable to cybersecurity issues, and therefore unsafe.
Just because you can keep something working does not mean it is as safe, reliable, or clinically effective as a new "state of the art" device! The COCIR "Golden Rules" are therefore a very good guide.
