visionOS is just iPadOS with the white space rendered as frosted glass and a slightly different Home Screen, it's the same thing just rendered on top of whatever you are looking at.
I do believe in the next few years we'll see the same happen to macOS with all apps replaced by their iPadOS counterparts just sitting on a desktop with menus in the top left. The macOS branding won't go away but it's clear what the direction of travel is and it will make all apps the same across all platforms, they just scale depending on what device you're using.
We're rumoured to be getting touchscreen Macs in the next year or so, it will be then when this change happens.