Random insert point, but all this 1:1 comparison to the existing extra monitor concept of operation is emblematic of resistance to XR in general. I see it as trying to shoe horn today's use cases as a template for something that is literally a phase change of capability -- much like how the first automobiles were framed by the lense of horseless carriages.

3D in 3D is different. And when you put 2D screens into a 3D digital space viewed as embodied in 3D XR you still get affordances you didn't have before. Sure you need to reimagine and rewrite from the ground up these long established and stable 2D apps, but there are places where real gains are there to harvest.