Comment by llm_nerd

Regarding #2 and #3, Apple has been working on this for years. ARKit for instance, is hugely gimmicky if not silly on iPhones, and LIDAR on the same had incredibly limited real world utility for that device. Yet for years they've been deploying millions of equipped devices, building it out, expanding the SDKs, doing developer outreach, and so on. They've even built shared AR spaces when the viewport is just a phone, again despite it being pretty goofy and of limited value.

They've been building towards this for years.

I suspect for most apps supporting the Vision Pro will be supporting variable resolutions (for resizable windows) and clicking a checkbox on the targets.