They shipped iPad Stage Manager half-baked, to get iPad developers ready for double-buffered windows, so they could eventually ship the visionOS macOS integration half-baked? Doesn't sound right at all to my ears, even though I'm stoked for my order!
EDIT: -5* doesn't make sense, this is the most polite way you can point out that getting macOS apps windowed on visionOS has ~0 to do with double-buffered windows on iPad OS. n.b. I didn't use half-baked, OP did.
I don't think it's half-baked. I think it's lightly toasted. :-)
I use iPad Pro as a kind of sidecar daily driver, in the magnetic dock magic keyboard w/ trackpad.
As I type this, the screen shows a traditional MacOS style dock across bottom, four Stage Manager window clusters I can tap with a thumb on the left, and Safari plus Messages taking 2/3 and 1/2 of screen respectively.
There's more app and pixel real estate than most Windows laptops, and bringing screen sets to the foreground or swapping them back to the side is so natural I almost feel like giving up that space on my Mac as well.
The big thing I saw happen from apps over the past two version of iOS is app devs realizing their windows will not always be full screen or 1/2 screen size, but arbitrary size.
By now, most iPad apps of any serious nature are effectively window size independent, making them play well with others in stage manager. It's easy to see how that would make them play well with the headset one day.
No, I'm saying they shipped iPad stage manager half baked for their own uses/ to refine for AVP. I'm positing that a major reason for macOS stage manager's existence is as a transport layer/ "texture formatter"
EDIT: -5* doesn't make sense, this is the most polite way you can point out that getting macOS apps windowed on visionOS has ~0 to do with double-buffered windows on iPad OS. n.b. I didn't use half-baked, OP did.