Probably because 105mm makes for a really good portrait length, people assume that this is a portrait lens and while it is an excellent lens for that purpose, I wouldn't necessarily pigeon-hole it like that

It’s designed with a range of ideal focal lengths for portrait photography, and the wide maximum aperture makes it easy to blur the background—which I love!I enjoy being behind the lens and I simply LOVE portrait photography

It is a great focal length in terms of flexibility, distance and mobility

It kills the 85 1.4g too.

Dump your old 85mm G, Otus and Art Lens, this Nikon 105mm E is as sharp and good as Zeiss Otus with Auto Focus and without the poor bokeh & unreliability of Sigma Art lens, which I would never buy again