Linguists treat many technical terms as so well-established that they are not in need of explanation or definition, or that any further discussion is a secondary matter. But even a widely used term such as “word” is not well-understood (Haspelmath 2011), so it is not surprising that more specialized terms such as “noun incorporation” suffer from the same problems. This is clearest if one defines “noun incorporation” in terms of wordhood, as in de Reuse (1994a: 2842), where noun incoproration is defined as
“the morphological construction where a nominal lexical element is added to a verbal lexical element; the resulting construction being a verb and a single word”
A few months ago, there was a lively discussion at Languagehat of my proposal that grammatical theory should be framework-free (Haspelmath 2010), and that each new language should be approached without preconceptions. Some discussants agreed, but others disagreed. As so often, the physics analogy came up:
I cannot imagine a physicist publishing an article saying, “We have no chance of discovering the Higgs Boson, and even if we did it would not solve the problem of where gravity comes from. So we ought to close CERN and go back to tabulating meticulous measurements of planetary motion.” And it seems that this kind of retrenchment is what is proposed for linguistics.