Regarding #3, my understanding is that each .result is a separate concrete type so returning different ones with #available won't work. Am I misunderstaning this?

Regarding #4, I responded in that thread that the solution causes an error in Xcode. If it worked, it would be a great solution, so hopefully it is a bug.

I have tested this in XCode and it returns the error: 'extension' macro cannot be attached to extension (extension of '[my entity]')

Feedback# FB22970878

Thanks for the reply. I'm not sure that speaks to my concern. I am talking about the way you can switch the window in which a cursor appears simply by looking at it; and not just your own app windows, but all app windows. Whereas with MacOS iPadOS you have to manually move the cursor to the new window and click on it to get focus, with visionOS, you simply turn your attention and move the cursor, not even needing to click. Ideally, I would like to be able to reject that cursor focus.

I suspect the key step here is the unpairing. I followed these steps, and it did not work for me until I restarted Xcode.