It is learned that Oculus is focused on keeping walls up when it comes to the exclusivity of many "Oculus only" titles. Oculus founder Palmer Luckey recently defended the decision, comparing the Rift to the exclusivity that PlayStation VR will offer.
"You see Sony investing in their content the same way," explained Luckey, via TechCrunch. "They want to make things that take advantage of their features that they have in the best way possible. Over time, that's how the VR industry is going to move forward. In the short‑term and the long‑term, it's good."
But it is likely that Oculus has taken a step forward to assuage the angry customers about their practices, namely, after a recent update, it seems that the headset check has been removed from the Rift as a form of DRM. Previously, when running a game, the Rift would check to see if you were using an Oculus headset, but it is now removed and that opens the door for gameplay using other headsets. This change was noticed recently and Oculus is yet to make any official statement on the headset check's removal. You need to wait and see what exactly Oculus has planned.
If you are still trying to find out why this is a debate, a movement is on among VR enthusiasts to keep the platform as open as possible.