In other words, new tech products fail usually because the cost/benefit ratio for the potential customers is unfavorable.
From what I've observed, this is almost always because what the people who made the product value[1] is not at all what potential customers value. The product either doesn't meet a need the customers actually have, or it comes with a downside that is far more important to customers than it was to the developers.
[1] What the developers of such products usually value is "shiny new tech" and usually comes in the form of "we figured out how to do this cool thing and are trying to come up with some sort of product that makes use of it". The products resulting from this line of thinking are usually more a tech demo than something that brings real value to real people.
