That's an example of one of the few ways in which they conservatively decided to copy one successful feature that rose out of a literal sea of ideas.

I didn't say they never follow trends, in fact I explicitly pointed out when they did -- to ensure that iOS and iPhone don't fall behind on critical features.

Fact is, Apple could not care less what gimmick or spec Samsung is introducing. Apple will not adjust this years iPhone because of any feature or spec that Samsung introduces, and they've never done that in the past either. The biggest change like this would be perhaps Jobs' frantic last minute change from plastic to glass screen, a "rest is history" kind of moment.

If Samsung's new feature this year is that important then Apple will introduce it in a few years. They're not in a rush. Years late to mobile payments, years late to e-watches, years late to large screens... they do not make quick changes.