Back in the era of Palm Pilots and Blackberries, most people didn't have one, but the people who did have one tended to use them extensively every day. Today, most people don't have VR headsets, and most of the people who do are letting them collect dust on a shelf in their closet.

In the first case you have a type of product that is evidently very useful but isn't ready for the general public. In the second case, you have a product that early adopters can't find a routine use for.