I'm glad he talked a bit about what this thing is like with a trackpad / cursor, because for productivity that seems like it's the only real way to use this device.
Apple still uses this tactic a lot, and it’s one of the things that irritates people most about them. I’m glad they do it, but it’s understandable why it pisses people off.
Apple for the most part doesn't merge two unrelated functions in a peripheral or component.
For example, they never did the "2 in 1" thing with the Mac that Windows vendors did by having a tablet using a touch interface that was also a laptop using a keyboard and mouse. The result was a device that wasn't great at being either a laptop or a tablet. I have a Surface 2 in 1 and it's not a particularly good experience.
The early adopters of the Apple Vision Pro will already have mice, trackpads, etc. on their Macs and iPads that will work just fine.