Not only that, another hilarious idea is that customers actually influence much in a market like this. People don't choose the closest phone to the hypothetical most perfect one for them - they choose out of what's available to buy, and the decision which one in particular is mostly driven by a) price, and b) marketing.

I'm yet to see a person who'd say "You know what? It would be cool if the new phones had heart-rate sensors.". It's always "oh, they put a heart-rate sensor in that phone, cool.". Driven by what manufacturers do, not what the consumers want.