Guarding against people doing shit that goes against common sense -- as well as Apple's "very explicit" warnings -- while using a third party battery that maybe might somehow malfunction, is an annoying reason for them to make a decision that costs me extra money.
Wow that's actually terrifying! The best part is while watching their cool video showcasing how terrifying it was, the WSJ exemplified why in part by jamming an ad right in there when I tried to skip ahead. Hope a full screen ad never blocks the view of someone skiing, it might end badly.
The AVP is not AR though. Regardless of passthrough and their "Spatial Computing" marketing. It's a VR headset that will black out, and not stop "augmenting", the moment the battery get's disconnected. If you're skiing that might very well be the difference between hitting a tree (or worse, another person) and avoiding it.