But is the issue not more the term of address, in a practical situation?
Presumably anyone with a PhD has the right to call themselves 'doctor' but it's how they relate to people - e.g. in a medical sense, whether the patient does (or should) say "Yes Doctor, no Doctor" or whatever - and also whether the doctor expects this formality/professional deference during conversation.
Presumably anyone with a PhD has the right to call themselves 'doctor' but it's how they relate to people - e.g. in a medical sense, whether the patient does (or should) say "Yes Doctor, no Doctor" or whatever - and also whether the doctor expects this formality/professional deference during conversation.