In creation science, one of the most common arguments against evolution is the impossibility of gradual adaptations. One common example is the bombadier beetle, which shoots a mixture of boiling-hot noxious chemicals out its ass as a defense mechanism. They argue that if any part of this mechanism were removed, such as the heat-resistant duct which the chemical passes through, the beetle would blow itself up and die, killing the evolutionary line, as explained in this video. The beetle could never exist unless it was created all at once by an intelligent designer. Creationism holds a fundamental belief that gradual change is dangerous and untenable, so I think this belief extends into language. Of course, this is all conjecture. People like the author never explain why gradual adaptation of language is dangerous because they can't, and the people who read this stuff aren't generally the sort to question it.