I didn't see display resolution (or the model of HMD) mentioned in the video. I'm using Varjo Aero, which has 2880x2720 per eye, which is almost quapruple (per eye) compared to Valve Index. I think this resolution is enough for a good VR experience; pixels are almost invisible, and even small text is readable. However, HL Alyx doesn't run at 90 fps on full resolution.
Uh, Varjo Aero is a clear outlier in terms of resolution and definitely does not represent the current typical VR headset experience (which in early 2022 would be around Quest 2 or Valve Index). If you went out of your way to get an expensive niche high-end headset, it struggling on a 3090 is your problem, not HL:A's.
I'd say that its just a couple of years ahead of the mainstream curve. My thinking is that Apple probably wants to make a very high resolution VR headset (similar or close to Varjo Aero), and it seems that with their new chips, they might be able to pull it off.
That HMD looks pretty badass. Didn't realize hardware support for eye tracking/foveation already existed. Does any software support it? That would fix your perf issue.
