> We can pump out software quickly

Cardboard is there for many years now. How easy and quick to develop Linux VR desktop for smartphones? I'm waiting for it long time, even ordinary GNU/Linux - AKAIK only one modern smartphone runs it (pine), whereas all desktops/laptops I now run Linux more or less (for less I mean Mac).

E.g. even for pine it now takes years for make e-ink reader with Linux, AFAIK they sell still for developers only.