In native mode? But the Rift has another layer in there with the Oculus driver, and it’s also the standard resolution.
There’s enough differences that it doesn’t surprise me at all if the Rift works in native even with FlyInside still installed.
But to be clear, the Vive Pro also worked with FlyInside and X-Plane 11.20. It just had some distortion issues and presumably didn’t support the higher resolution.
To be honest, though, if it’s a choice, I'd much rather have FlyInside for P3D 4.x working than spend time on X-Plane. The native X-Plane implementation is really very good. There are some nice features of FlyInside I miss, but with the native being good, it’s not a big deal. P3D, on the other hand, doesn’t have near the polish on its native VR mode so I still consider FlyInside important there.
And hopefully all versions are getting refreshed with Pro/Odyssey resolution support and not just standard resolution on 11.20. Please... Please...