Followup question: If we wanted to build a similar 3D UI experience for iOS with buttons etc, what framework can we use as of today?

Thank you for the reply. It's a no-brainer to have these on other platforms so developers can build continuity applications that are ARKit/RealityKit based. I know you cannot discuss it yet but, I am hoping it's on the horizon. Imagine people joining from their iPhone or Mac into the same experience. We can still build it but it is going to require a lot more development as of now.