Sounds like they're porting core Rift games like Robo Recall. Now that both the headset and controllers are 6dof there's no reason they can't do others as long as it can run on the hardware. The reason Go and Daydream have more limited experiences is specifically because they're either 3dof headsets or only have simple 3dof controllers if not both.
And speaking from personal experience, things like lighting and image quality have a massive effect on my overall sense of presence in VR. It's a much bigger deal than when you play a game on PC vs console. Much less PC vs Switch, which is what I suspect the hardware to be similar to.