I think that explains it. I was very lucky as I was a junior doctor at the time and had good contacts. The ENT surgeon was happy to do the surgery for lifestyle reasons (i.e. diving). Not all will, especially in a public health service. I professed my desire for ear drum strength over hearing. He agreed and did a cartilage graft. This was in 2010 and many hundred dives ago. Zero issues since that time.
I understand your name now. I’m from Springbok country where we too have MBs and not MDs.