I guess I just don't get it, you had specifically mentioned AR. I can see VR being used for short shifts, when I had my VR headset I could only stomach an hour or two. But AR, if done right, can be an all day thing.
I view AR as a tool that helps people solve problems. Not something that would be used continuously all day; such as normal computer use.
For just one example... A home/building/landscape architect who conducts a walkthrough of a home/building/garden he/she designed for a client.
Allowing a client and home architect (two AVPs) to walk through the designed home going into every room and space, with the client suggesting changes if needed (and the architect being able to make simple changes on the spot), so the client can get a realistic feeling of their new home. And if satisfied, approve the design.
Something like the above might take an hour or two if there are minimal changes.
Currently client design approvals are done with a set of paper drawings showing a 2D top view plan. And/or looking a computer screen of a set of images that are 3D rendered on a 2D screen. Neither are very good.
A landscape architect would do the same thing with a client; walking through front/back gardens, suggesting changes (plants, rocks, walkways, trees, mounds, hardscape, sprinklers, etc), and if all is good, the client approving the plans. That should take about an hour or so if the design is close to what the client expects.
And of course interior designers working with a client doing a walkthrough of interior spaces, considering chosen furniture, rugs, tables, beds, paintings, etc.
Again... the above is just one example. There are countless more. None of which involve an AR headset being used continuously for an 8 hour day.