Yeah, I don't know what it's like in Unreal land, but I suspect the learning curve tends to keep the amateurs and those not interested in going the extra mile to create a great experience away. With Unity, there is so little in the way of tools for creating good VR experiences, and many of the default tools and settings are actively bad for VR.

Unity's default stuff is so bad for VR and I've replaced so much of it in the last three years that I'm pretty close to having my own game engine. In another year, I could be completely off of Unity and running on just Xamarin.