Because the glasses are too big, or the implementation sucks.
I don’t want to see an arrow where I need to go. I don’t want to wear a VR headset.
I want regular glasses. I want the road I need to travel to be a yellow brick road. I want to see the person I’m calling in front of me. I want some details about the building or business I’m looking at when I ask for it, like opening hours, phone number, reviews.