"developer just need to create the software part"But if I want to add these features using PSVR2 on PC I can... developer just need to create the software part.
The hardware already exists.
that's like saying if you want to be a billionaire "just go get 1 billion dollars"
It's not that easy, if it was, Sony would have all those features enabled out of the box with the adapter, but they didn't. Because it would take years and it's not worth the effort. Obviously the hardware exists, but the software is the challenging part....