Giving you the impression of a very large high-res monitor with VR goggles is quite a challenge, you'd need the displays in the headset to be significantly more

Giving you the impression of a very large high-res monitor with VR goggles is quite a challenge, you'd need the displays in the headset to be significantly more pixel-dense than they are (remember that while "retina" quality displays are quite mainstream VR requires them to be very small and light and the black gap between (sub)pixels to be as thin as possible to avoid the screen door effect). Say you had 4K per eye (I understand it's accepted that 8K per eye is more realistic), that's 8K or 16K driven at 90Hz, you would need some serious graphics horsepower to drive that.