I use it as a fancy monitor that I can strap to my face and fits in a suitcase. sometimes I want to work lying down and it's great for that. It being based on ipados makes it kinda useless aside from the display.
Not OP, but I type while lying down in bed. I don't have the AVP, but I do have xreal Air AR glasses that basically mirror my macbook pro's screen. I rest my Apple keyboard across my crotch/upper thighs, wherever my arms are most comfortable. To my right (on the bed) is my Apple Trackpad. It's kind of a hastle to move my hand from keyboard to trackpad, but I can drive almost all functions on my computer through the keyboard, so it's only used as a last resort. I also have airpods in my ears because the laptop is closed and on the floor.
I do this when my sciatica pain is preventing me from sitting and I'm tired of standing at my desk. I can work lying down for up to a couple of hours and find the position to be highly comfortable and productive.