The historian of religions Ulf Drobin clarifies Trubetskoy's point: "all classification must stem from criteria. The followers of the language tree t… - Stefan Arvidsson

The hypothesis that somewhere, sometime, an Indo-European race has existed has always been anchored in linguistic observations. But during the nineteenth century, racial anthropologist also began to discuss the Indo-Europeans, which came to mean that the proprietorship of philologists in Indo-European research was questioned (Arvidsson 2006, p.41).

According to Lincoln, then, Indo-European research misses what is instructive about studying myths and religious texts in the first place, since it demand that the researchers leave the historically and socially determined place in which they were used in order to reach the imagined Ancient Arya., "the never-never land east of the asterisk," to use the expression of Lincoln's colleague Wendy Doniger (Arvidsson 2006, p. 303).

According to Renfrew, there are many pitfalls in the attempt to create an “inventory’’ of Proto-Indo-European words. For example, it can be very difficult to determine whether a word truly is inherited from the Proto-Indo-European vocabulary or has been borrowed later from an Indo-European sib­ling language. If this question cannot be resolved, it is impossible to determine whether the object or phenomenon that the word denoted existed in the Proto-Indo-European homeland or is something that people became acquainted with later. And how can we know, Renfrew continues his critical review, that the semantic meaning of a word has been constant over the centuries? Without knowing that, one cannot use the word in question to create a picture of, say, the fauna that the Proto-Indo-Europeans were familiar with.