As you say, the patient requested this and is probably happy. Some people will have wanted a fuller denser hairline rather than a mature receding one. He may want to preserve his donor, who knows without the patient's input.
If he sees it as an issue, a small touch up would suffice.
You have to look at the bigger picture. Is the clinic producing lots of hairlines that you consider would not make you happy? Or, is this a single example out of many you have picked out?