The Index is kind of stupid, the market for 1000 USD headsets requiring a 1000 USD computer to run can be counted on a single hand or something. I guess they don't care at all about sales. As for a Quest-like device, probably too early. Maybe in a couple of years you'll have something a lot more impressive, and cheaper in that form factor.
1) in deficit = there's not enough capacity to meet the demand, most likely. They don't make these kind of headsets by the millions in the first place. 2) There's always going to be a large amount of people who are early adopters no matter what, do not assume the market is huge based on such people. It's not the first time we see that.
Not just the whole Steam ecosystem - pretty much all big game development is tied to x86 architecture, and powerful GPU cards are tied to x86 as well (as far as I know there are no drivers for GPUx outside of x86 for current GPUs whether it's AMD or Nvidia).
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