its partly in the article. Companies like Xbox and Lenovo want different experiences for their clients. This allows them to share the basic platform but specialise for their customer segments, eg professional or Xbox owners or whatever. Architects and civil engineers and doctors might not want normal game controllers and the default resolution. Cheap devices used in developing countries can have a lower resolution and no hand tracking. Meta wins because they can’t build 100 versions themselves, all they care about is growth of the market. Nothing is locked up yet, think of a market 100x bigger.