Pick.
Automobile used the be the proper term for a car.
Firearm used to be the proper term for a gun.
I could go on all day.
Law, business, and higher education are full of "proper" terms (pretentious dribble that has common jargon equivalent terminology) that hold no value whatsoever for common folk. And, to me, that means they have little value at all.
We harbor these silly notions that the way things were said anywhere from a couple hundred to 500 or more years ago is "proper".
I rather enjoy pretentious language during extremely important events (some of the letters written by the founding fathers while we were hashing out what would eventually become our Constitution, for example).
But I work in the medical industry. One thing I think would greatly enhance the customer service experience for patients (and make no mistake we are all in customer service) is using plain English when talking to patients. I frankly didn't care that my surgeon knew a four-word 18 syllable way of saying "knee surgery". I wanted to know what he did and how that will affect my life from this point forward.... in simple terms.
Yeah, pick.