The original iPhone was one of the first phones to have visual voicemail. That alone made it a revolution compared to the phone experience before it. Before iPhone you dialed some voicemail box and had to listen through 4 messages before you got to the one you cared about. Yeah if you weren't there it's hard to understand how bad of an experience it was.

In my opinion some sort of this technology would be very useful. If not this, then something else. Being able to see the map on the car window, or a map when you walk, or information about products (something similar to Google lens but no hands).

I can easily imagine warehouse workers using this to tell them which box of little chips to pick-up. Of course everyone talks about building completely automated warehouses, but still there are lots of non automatic ones.