> I still don't see how it could be sold to a large public.
> Either you need theses devices for very complex task, or for very simple task.
> For everything in between it s not really needed.

This is a very real point. I kind of tried to show a similar viewpoint that a non-mainstream device can only do the "basic" stuff and thus has very little utility. Similar to Meta trying to do very basic collaborative conferences, but being unable to do much more complex scenarios. Their recent realization about people expecting legs on avatars for instance showing even their basic experiences required some more advanced features. When the hardware doesn't accommodate that it falls short.

I really don't think it can be sold to the public until it's a complete mainstream device that covers basic to complex tasks. It's one of those devices where you hand it to someone and once it's there people will be like "okay, I can't go back to 2D displays". It's something you'd have at work and home and is part of your life like a cellphone once was. Anything that you just take off and set to the side will end up similar to VR headsets.