Just a wireless adapter for the index would be nice, though it would have been nicer 3 years ago. The cable makes the barrier of getting it out of the box pretty high for me personally. Still definitely don't want the mobile level graphics of a fully standalone headset though.
The Deck's AMD Van Gogh APU can't be had in any other device and is substantially different to any other chip AMD produces.
Is it really that different? I thought it was basically Zen 2 CPU cores and RDNA 2 GPU cores. It's not an off-the-shelf SOC, but it's also not that custom. So this seems a little hyperbolic to me. I'd say it's pretty similar to the XBox Series S SOC (and Series X and PS5), which uses the same cores, just a different amount of each.
I also think it's kind of interesting that they're jumping to a VR Headset. If it's a standalone, it's probably not "low power." If it's not standalone, I think they'll have issues transferring data fast enough to be practical. So my money is on some kind of accessory, like maybe a Steam Link 2 or a controller. Those are low power, wireless, and seem to fit the bill a bit better.
Then again, maybe it is a VR headset. But I really don't see them competing at the low end on VR.