It seems iPad OS will want to follow Android's model [1] so when you plug in a real monitor then it becomes an actual full desktop experience with real overlapping windows. The toy OS display server iPad OS provides today simply doesn't cut it in the real world of desktop computing.
[1] https://arstechnica.com/gadgets/2024/06/googles-pixel-8-series-finally-supports-displayport/
[1] https://arstechnica.com/gadgets/2024/06/googles-pixel-8-series-finally-supports-displayport/