If they can’t use the long standardized BC then I can’t be bothered to consider them to be anything other than butt wipes.
The purpose of writing is to communicate ideas. BP, BCE, ETC. AD and BC have been accepted for well over a thousand years. They are almost universally recognized. Why do they need to be improved upon? Of course the answer is that people are occasionally offended. I am offended by Arabic numerals therefore I will only use Roman ones. How do you think my banking is working out? Well that how things go in the year 3 ABW (that’s After Butt Wipe.)
They use the standardized BP because it’s a radiocarbon date.