I think part of the problem is this weird insistence that VR means having to physically move arms around etc. For most games, the visual experience of VR can vastly improve immersion, but control schemes nearly universally suck. Simulators work so much better largely because they don't fall into the same trap - if you're playing a flight sim, say, you're still probably using the same stick/throttle/pedals as you would without the headset. For space sims, I find that headset + mouse combo works amazingly well (End Space is a good showcase of what can be done there). And so on.
But for some reason there's practically no uptake on any of this outside of sims. I would love to see a first-person shooter that is fully VR enabled while still allowing me to use WASD + mouse. In fact, I already kinda sorta do that by using 2D theater mode with games like Insurgency: Sandstorm, but that doesn't give you the actually useful VR stuff like the ability to turn your head to look around etc. If somebody were to make an FPS that did all that, they'd have my money in a heartbeat.
That some reason is motion sickness. There has to be consistency with your perception, else it develops into compounding vection feelings. It tend not to apply for vehicular controls hence sim usage.
That varies from person to person. I have played games with keyboard and mouse in VR (e.g. Polynomial 2, or the unofficial GTA 5 VR mod), and it works great for me.
But for some reason there's practically no uptake on any of this outside of sims. I would love to see a first-person shooter that is fully VR enabled while still allowing me to use WASD + mouse. In fact, I already kinda sorta do that by using 2D theater mode with games like Insurgency: Sandstorm, but that doesn't give you the actually useful VR stuff like the ability to turn your head to look around etc. If somebody were to make an FPS that did all that, they'd have my money in a heartbeat.