Earlier quoted context omitted.
It's worth pointing out that, in linguistics, grammatical gender can be seen as a specific type of noun class system. The term is mostly useful when talking about Indo-European languages where the feminine-masculine distinction is most prevalent It's also worth noting that grammatical gender evolves over time. Originally, most Indo-European languages had the three classes of feminine, masculine, and neuter. But, for…
>Originally, most Indo-European languages had the three classes of feminine, masculine, and neuter. Early Proto-Indoeuropean is theorized to have 2 genders - animate/inanimate, but by the late PIE period it evolved to the classic three.
Of course, this is largely theoretical like you said, and I'm sure you could dig up some dissenting papers if you wanted to.