Methinks we get hung up at times on words and make a moehill out of nothing. In England a medical doctor did not have a medical doctorate. Have another look at the medical degree! We called our medical practitioners, "Mr." It was an insult to call him "doctor". The doctoral degree was originally in other professional categories and not medicine.
Further, the official full and proper address for the clergy was; The Reverend Mr. John Doe, and he was addressed as the pastor of a church. It was made simpler to use Rev'd John Doe.
To satisfy some of the simpletons, maybe we should just use our Canadian designated number, the same number we apply to official documents, such as married, death and even birth certificates.
Personally, my name has always been Jim.....then, in England, it was improper to address a man by his first name until he gave you permission to do so.
The fact remains, my post office directs my mail to me whether I am addressed as Rev., Dr., Mr., or even just Jim.
Cheers,
Jim