But they have been clear in the presentations that this is the same. It's running a handful of apps, it's not some full laptop-like experience. I would bet it's anyway using most of its computing power just to draw on the displays and to do realtime image recognition to blend the 3D windows into the image of your own room. You'd need far more computing power to actually get a full laptop experience in addition to all this.

Sure, it will have that locked in experience to start and lack the computing power to compete with a traditional machine. It doesn't mean it has to remain that way. They've tried to push the iPadOS further in that direction for years.

There is no intention that Apple might ever make iPadOS fully(ish) open like macOS is. I don’t see any reason to believe that their VR devices will not stay locked down forever too.