If I were in Zuckerberg's position, I would leave the Oculus to gaming and let it mature there and maybe sell it similar to industrial use cases. I would then focus on Rust and typescript and create an OS on the phone that allows you to run Rust and Typescript apps. Likely a typescript bridge to rust. Now you have a whole ecosystem and developer community waiting to disrupt the mobile device with the two most popular languages. They will naturally build for the web and then for the Rust phone that runs typescript Natively like the React Native JSI for rust. Zuck if you're reading this, this is how you survive and beat Android and Apple. Use the power of developers who will innovate the shit out of the system that will likely not exist fast enough on the other two phones