I agree with the previous posts. That being said, I had my metal ions tested after 12 years with a successful resurfacing. I had no pain or other symptoms. Like you, it was “out of sight/ out of mind,” but I had the testing done to appease our son-in-law who is a young ortho surgeon. He was taught that routine blood testing is valuable. To my surprise, my blood ions were elevated and a follow up MARS MRI showed fluid build up. I ended up having revision surgery in September with Dr. Pritchett. He replaced the cup with a poly lined cup. Smooth recovery. His opinion was that I would have started having significant symptoms and there might have been tissue damage by then. His recommendations were seconded by several other top resurfacing surgeons after they saw the MRI.
Your doctor may in fact have a point about the tests, although his bedside manner sounds bad.