How about AR-assisted cardio thoracic surgery? Or AR-assisted client walk-throughs of architect designed homes? That's just two of a huge number of AR applications that are in use today.
Those are extremely niche scenarios. So for the off chance that i can actually buy a home, and hire an architect to make me a home, find an architect talented enough and to my liking, the architect also has to be savvy enough to put his designs into ar, i as a client also have to happen to have the right hardware to view said designs? This souns like it would doulbe the design costs. Most architects barely give you plans and sketches during design.
Maybe it is for large developments, but those are usually massive revit models and macs cant even handle them.
Also vr doesnt give you a sense of the right scale.