When Apple says that battery-life is important in mobile devices, they mean it. If Samsung says it, maybe a year later they will turn around and bring out an eight-core phone that you can play a game on for forty-five minutes before having to plug it in again.
Apple isn't just opinionated: it's opinionated on hugely difficult technical issues that don't even exist in the wild yet. (As when they release a new category.) You only get that through violent discourse with egos on the line.
edit: a similar thing happens at Google, but not when it comes to ergonomics or user interfaces and usability with the same hardware devices Apple makes, but instead when it comes to solving certain problems on a massive scale. The result is that Google can't really release a laptop that's as usable as a Macbook in the same domain, and for everyone, and Apple can't really solve the ops issues that it would take to bring out a Google Search competitor. There is huge amount of discourse (of a radically different nature) at both companies.