Game design is the backbone of XR. Game design, aka the art of getting someone to do something for the sake of it(i.e. without pay), is taking over all aspects of daily life, business, and the work place.
It may be uncomfortable having the video game industry behind most of XR, but it is nothing but natural. Game design is a new literacy in the digital age, and those who understand it have ever growing leverage over reality.
Humanity today perpetually holds devices in our hands, and who best to keep us using the devices but designers who are learned to make us want to do so? Even enterprise use cases benefit from design that encourages use. Better productivity to say the least.
Not having game design talent on an XR team is a recipe for applications no one, spare the nichest of users, will use. At least not for long. Better designed applications built with human behavior in mind will sooner or later sweep in.
Non-game designers should partner with game designers or study game design(not gamification) themselves if they wish to create XR applications with any sort of sticking power.
A blending of game design into general XR design is the future of mainstream XR, both consumer and business use cases.