Why's that? They can get the weight down to barely more than glasses, and with good pass through video and battery improvements... You'll be pretty unencumbered. Certainly not more encumbered than being glued to your laptop on a desk.
I've not used a laptop (or computer) at a desk for decades, I prefer lying down, which works really well.
I do wish there was something between a laptop and a phone though. Interfaces need to improve or innovate, but I don't think VR headsets are the answer. I haven't even touched on the nausea.
With AVP, Apple is taking a bet that the accessory nature of previous attempts is why this product category failed and so they're trying to embed the compute and make it wireless.
Unfortunately for utopian visions of VR goggles, we're running up against the limit on how small computers can be, so the idea of a standalone headset as light as Bigscreen VR is essentially science fiction at this point. Not to say it won't happen, but if that's what it'll take for this product category to take off then your optimism is misplaced.
Perhaps something along the lines of zapping the back of the eyeballs with lasers is the answer.
Even after 36 years of wearing glasses (current ones weight barely 20 gram), they still bother me, and I fiddle with them constantly.