The origin of this terminology seems to me to lie in a bit of purism.
Such a doctrine is a doctrine of puritanism—or purism, which is worse.
As a general rule, I think, educated Americans are more apt to err on the side of purism than of laxity.
The simplicity and purism of the tea-room resulted from emulation of the Zen monastery.
No writer of the period has such a command of pure English, unadulterated by xenomania and unweakened by purism, as Daniel.
The third party took the name of Peter, or Cephas, as in their Hebrew purism they preferred to call him.
But this was not so much a matter of purism, but rather the old quarrel between Lombards and Tuscans.
Though strongly tinctured with Ciceronian purism, his taste was more austere than Bembo's.
This is not a time for purism of style; and style has little to do with the worth or unworth of a book.
purism, whether in grammar or vocabulary, almost always means ignorance.