Extra battery comes standard in Korea. It's cool. I miss it, though sealed batteries make for better designs.
But then a high % of people use cases. What is the point of design then?
Right now i am using my note 4 without a case. It's fake leather back is awesome looing and has great grip. It's removable battery will allow to use it for more than two years with a simple replacement (will give it to my mother or other relative).
And design wise it is great: still a samsung device, but not stall as Galaxy S design, that has become boring because it can be found in most of samsung devices, there are alot of the,
Samsung, as sony or htc, should only copy Apple in one way: less devices every year, so confusing. A flaship, a phablet, a mid range and a low cost device. They should also be called differently enough, otherways people associate xperia or galaxy with cheap devices instead of high end ones.