You are correct that the touch controllers are essential for immersion. After getting the controllers, I've stayed in VR longer than I've ever had in the past, and the comfort level has increased significantly. Google earth VR is so much more addictive now. Also demo'ing it to people requires no feedback since the learning curve is so low.
The room scale works really well but is limited because of only two cameras. But adding a third camera would make it full room scale (which Oculus has announced)[1]. Combine that with new wireless hdmi/usb adapters for VR [2], full room scale VR is almost here.
I run a 3 camera setup and it works fine for my 10 foot by 10 foot play space. I have a fourth, but I have been too lazy to set it up.
I do run two Inateck PCI-E USB cards so I don't run into capacity issues. There are many reports of issues running > 2 sensors and difficulty getting the Inateck cards working correctly due to driver version issues, USB power management etc.
The room scale works really well but is limited because of only two cameras. But adding a third camera would make it full room scale (which Oculus has announced)[1]. Combine that with new wireless hdmi/usb adapters for VR [2], full room scale VR is almost here.
[1] http://www.roadtovr.com/oculus-touch-support-room-scale-360-...
[2] http://uploadvr.com/tpcast-wireless-vive-kit-works/