Agree and disagree. But first, one has to understand how this works and differentiates. It is basically an extension of your apple watch, phone, iPad, MacBook, or TV. It simply puts apps up in the foreground while the background is your normal vision.
Each use case is a stand alone use case. I can easily see it being used by people who work at home. This may have way less screen damage to your eyes. Regardless, you can have your desktop or apps up and you look away or at other things. You would end up looking past, or through, the desktop and see what you want to see. So if you are a work at home parent, you can easily glance over to your kid if there is a noise or whatever. At the same time, you can zoom or enhance visuals. So if you've got a small spreadsheet, or want to zoom in to see what the dog is eating, you can do that.
But there are other applications. You no longer need to buy an 85 inch TV. You can play virtual reality games. VR can be built into any application or app as an click on option. You can take photos while hiking as an amateur or a pro. Lets say you are hiking Gacier and think you see something. You can zoom in, see a heard of mountain goats, and take a picture or video without having to reach into your pocket. You can take video too. It can replace a go-pro. It can be used to see the video from a drone. At the very least, it can replace all of those devices with one (TV, watch, phone, iPad, MacBook, camera, video camera, binoculars, etc.).
I can see a doctor wearing one to be able to access information and zoom in on the patient all controlled by voice. Heck with the Doctor, I'll wear one the next time I have to change my garbage disposal and need to follow along with a youtube how to video while still being able to use both hands.