Others have pointed out that Apple have shipped vapourware. Yes they have! And I'm old enough to remember how much buzz the Knowledge Navigator generated in 1987:
https://www.youtube.com/watch?v=umJsITGzXd0
It was exciting. It pointed in new directions. People were nerd-sniped. But in retrospect...
Apple wouldn't ship Newton until 1993, more than five years later. Nothing of importance from the Knowledge Navigator video made it into Newton that didn't already exist. iPhone was 2007, a full twenty years later. And we are only now getting close to the core concepts of Knowledge Navigator with LLM-based agents that can animate a human avatar in real-time.
Knowledge Navigator was billed as a concept video. Apple did not promise you could buy it in two years or two decades. But apart from some temporary hype... It accomplished nothing of importance for Apple or its customers. The 90s were so hard for Apple that they were nearly acquired by Sun Microsystems.
Shipping a demo didn't move any needle other than "engagement."