I was expecting to find information where it says that "doctor" was a title reserved for a few professions, and not just doctorate holders but I found the contrary, it seems most countries for some time have generally referred to all academic holders of doctorate degrees as "doctors."
JD holders in the United States are said to be able to use the term "doctor" but generally do not, and choose "attorney at law" or in some cases "Esq." Some professions people choose to use discretion. I heard of at least one academic institution that uses the term "doctor" only for physicians, but this is rare.
"In the
House of Commons of the United Kingdom on January 19, 1996, health minister
Gerald Malone noted that the title doctor had never been restricted to either medical practitioners or those with doctoral degrees in the UK, commenting that the word was defined by common usage but that the titles "physician, doctor of medicine, licentiate in medicine and surgery, bachelor of medicine, surgeon, general practitioner and apothecary" did have special protection in law. [1]"
"In guidance issued by
Who's Who published by A & C Black,it is noted that in the context of the UK, "not all qualified medical practitioner hold the (M.D.) degree" but that "those ... who have not taken it are addressed as if they had." [1]"
"A & C Black also note that British
surgeons - a designation reserved for those who have obtained membership of the Royal College of Surgeons - are addressed as Mr, Mrs or Miss rather than Dr. This custom has been commented on in the
British Medical Journal and may stem from the historical origins of the profession.
[1]"
I say all in all, I really don't know what they big deal is. It is just a title and doesn't have anything to do with performance, success, skill, or patient care that you have. I thought at first it was just a degree that you have to earn to do the specific job you want to do, but from the threads I have found elsewhere it appears different. I also met several people that said something about having a "white coat" as being a reason for being in a profession. I don't agree with this, and lol, I like having a bit of a fashion sense myself, and some variety, although the white coat is a nice thing.
[1] Wikipedia. Doctor (title).
In addition, I would think some reading of ancient history would help reveal more, but all I found thus far was the term doctor for 1 millennium being used for all doctorate level academic holders, but of course this is quite a debatable topic and I am sure someone will uncover a contradiction.