IMO, FOV is the biggest immersion killer in VR today, and doesn't get nearly enough attention. It's not so bad when you're relatively new to it as the illusion is convincing enough that you don't notice, but once the magic wears off a bit, it's hard to escape that binocular effect. I wish one of the bigger players would tackle that. I'm not willing to take a chance on Pimax.
Microsoft has a patent on a super cheap and easy way to improve FOV, but they cancelled Windows Mixed Reality so this solution will just sit in a vault forever.
TLDR, put LEDs all around the lens. They extend the scene even though they have zero resolution, you perceive the environment as extending to the full angular width you can see.
