I've been working on the Oculus Quest (which has the same resolution as the Index) and it's the lowest resolution I find functional. In my case, it's just barely good enough to use for long periods of time, without absolutely killing my eyes. Pretty excited to see what the next generation looks like.

It is, but it's still not quite there yet for productivity, I feel. We'll see what the next generation brings, but GPUs better keep up, as even the resolution of the Valve Index is already really punishing on the hardware.

I've found bigscreen pretty terrible for this, try something like virtual desktop.

If bigscreen has the option, curved displays are also a great way to preserve clarity, as the lenses start to distort near the edges.