[kguttag]

You are correct that MR today implies that the Virtual image is locked to the real world with some form of SLAM.

I was a bit sloppy in that regards. I was more worried about what was going on. But when combined with the word "passthrough" to see the real world, I tend to drop back/slip to the term AR passthrough which is what this type of thing was called for years. MR, as I remember it, is a more recent term used to distinguish different types of AR. Then things flipped and XR (=AR/VR/MR) was used to mean was AR used to mean.

My guess is that late in the program, the importance of passthrough was elevated, perhaps in response to Apple rumors, but they were stuck with the hardware that was in the pipeline. The passthrough available is a big improvement over the Quest 2 for use in seeing the grouse-level surroundings, but not up to regular use in full Mixed Reality.

There are probably decades of "optimizations" left to do.