Virtual reality headsets emerged around the same time as laptops and mobile phones, but they still haven't gained the same popularity. It would seem that the reason is not in the cost and complexity of the headset itself. But laptops also once seemed quite exotic and expensive compared to desktop PCs, and mobile communications were just proving their advantages.
The problem lies in human-computer communication. A VR/AR/XR headset, or glasses, is a computer just like a laptop or smartphone, and on a computer, the main tool is the keyboard. But a standard 101-key keyboard or on-screen keyboard isn't suitable. The natural method of working with this device, worn over the eyes, is touch typing. This method has always been considered the highest level for typists, as it can only be mastered through intensive training. It's like virtuoso piano playing, which shares many similarities in technique.
However, the problem here isn't that it's difficult to learn and practice, but that the keyboard itself has stagnated in its evolution. The energy of the Keyboard Luddites, who, as I personally feel, are clearly hindering the introduction of new types of keyboards, is what is currently standing in the way of development.