It's all about vocabulary.
Anything protected from outsiders must have a code that only the insiders know. That vocabulary of terms is the "fair maiden", protected in the towers by the knights in white smocks with black rubber tubes of grail around their necks and in their ears. To know "the words" is to be a member of the secret society of potions and spells that few are permitted to use or allowed entry.
And when the attacks at the gates by nurse practitioners, physician assistants, chiropractors, pharmacists and the many "non-knights" becomes too brutal, the knights convene and invent new words, new exams, new "steps", new rules, new regs, newances...and they smile broadly.
Mu ha ha!!
That'll keep them to the other side of the mote.
The fair maiden is protected again.