Before content, I would say the weight and comfort of the device. You can't use the product like a computer if you can't wear it comfortably. If you fix the comfort issue, then you open the door for more content types.Is it still supposed to be lower cost?
Also, what's the content plan?
The AVP's largest issue is 1st and 3rd party content and support.
This sounds like the iPad Pro / iPadOS issue again.
Apple just focusing on hardware while ignoring the real issues (software support)