Those "killer" features you describe... Apple spent about 3 minutes demonstrating Animoji during their September keynote. And they spent a total of 10 seconds on the iPhone X describing portrait mode and lighting.
Sorry, your assertion doesn't pass the sanity test. Either that or Apple has no idea how to market their "killer" features by sandwiching them towards the middle and end of their presentations.
I think you’ve missed the technological importance of those demonstrations and what it takes to do that. Is that specific implementation the selling point, no, is the technology in the hands of app developers to do something useful with it. Hell yes...