Good call. Consider anime: anime is mostly, save for a few good exceptions, made by studios of otaku for a target audience of otaku. The people who create anime learn by watching anime from studios that learned to make anime from watching anime from studios that learned to make anime from watching anime… And even when they try to break the mould they're actually just making anime of anime based on other anime based on anime. Every character and story is a composite of an anime interpretation of an anime interpretation of an anime interpretation, until eventually like a grainy rerecorded VHS tape you can barely even tell there was any kind of humanity involved in the production at all. Miyamoto wants Nintendo to avoid that fate.
Creative industries need people who understand the industry, but also balanced with other life experience to draw on.