I guess because digital only and no VR support in early access. Based of what I have seen, VR support will be very, very hard. How are they going to make sure the scene will run at a stable 60fps ?
Based of my experience, stable 60fps is possible in Dreams, but it's going to seriously restrict the graphics in most cases. Most of those most streamed dreams with big vistas or highly detailed stuff certainly arn't stable 60fps (even using the higher framerate mode on Pro, I can't imagine how those run on base PS4).
I hope they'll improve their engine in order to improve the framerate for all dreams. They could also make a specific very high framerate VR mode by lowering the resolution.
In the beta there was 2 modes: higher resolution or higher framerate, both modes targeting 60fps. But there was not much difference in resolution between both modes (on a 1080p screen anyways), but performance was noticeably improved in the higher framerate mode for all dreams. I think they could again lower the resolution for a specific VR mode.