I have a rift and I don't see any advantage. At the moment its too low resolution anyway and you can't read the UI elements. If you use your view control properly on your Xbox controller or your joystick hat-switch or your mouse, do you really think somebody using their neck has a huge advantage?
The scanner is the best way to get situation awareness quickly. I use the scanner first even when using the rift. I know where to look before I've looked there. I'm no better at this game when using the rift, I'd say if I'm wearing it I'm doing so for novelty/immersion or doing a
nice video and if you watch that video you'll notice I barely hit anything.
When Elite is actually released I can't imagine wearing an OR all the time every time I play, its a nice novelty but I still don't see it as an essential bit of kit for gaming. It gets hot and uncomfortable and even when they bring out the 1080 version it won't be as comfortable as looking at the monitor. I'll put it on to do a bit of exploring, but I won't be putting it on for combat unless its a preempted mission.
Oh and I thought the head padlock thing was deliberately excluded as its basically asking the game to do some of the work for you? It makes the OR a bit redundant, I wouldn't bother using the rift for a game that lets me lock my view to an opponent from my monitor. One of the reasons why WarThunder is completely useless with the OR.