I think the interesting part is being missed here, the behavior is that the file is being identified to apps by a uniquie identifier which is not the path, so referrering apps still find it after it's been moved, even when they didn't have it open already. More like using the inode as the identifier maybe? This is a behavior that goes all the way back through the pre-OSX macs. It was part of some sort of philosophy for Macs though I forget its name.
I think the interesting part is being missed here, the behavior is that the file is being identified to apps by a uniquie identifier which is not the path, so referrering apps still find it after it's been moved, even when they didn't have it open already. More like using the inode as the identifier maybe? This is a behavior that goes all the way back through the pre-OSX macs. It was part of some sort of philosophy for Macs though I forget its name.