The entire screen sharing setup they demo'd in the original Vision Pro demo reels always made me laugh. They've had years to get Sidecar right, and have failed miserably every time. How am I going to believe that they'll get wireless display transmission to work perfectly for this thing?
I haven't used the Vision Pro, so I can't say how well it works in practice... but with macOS 14 this year they redid their screen sharing app to, presumably, use whatever technology is underlying the Vision Pro display-sharing. It's really good. Vast improvement over the previous tech (presumably VNC?).
Assuming the Vision Pro screen sharing works using the same stuff, I have high hopes.