What matters for direct comparison with physical monitors is the PPI of the virtual "monitors", not of the tiny screens in the headset. If you have roughly 4K

What matters for direct comparison with physical monitors is the PPI of the virtual "monitors", not of the tiny screens in the headset. If you have roughly 4K per eye in the headset that renders everything you see, then you can't expect the virtual equivalent of a 4K monitor that only takes up a part of your vision. Lower PPI virtual screens should be usable, but the text may still look bad on those when you can't do things like subpixel antialiasing (macOS on 27" 1440p also suffers from this). Especially if you need to render small text at an angle. If you only work with fairly large text or with pictures/video, that would probably be fine.