Why oh why?
I don't see what the big deal is about the edge. Although it does make it easier to break.
I think Samsung made a decision on changing the back on economics. People tend to keep a phone with a replaceable battery longer, so by sealing battery up, when the battery starts to die, instead of replacing, you are kind of pushed towards buying a new replacement, so buy a 6 now, by the time the 7 comes out, your phone daily lifespan is cut in 1/2 and you upgrade to a 7.. How many of us are still on 3's or 4's or 5's?
Maybe this design change was made by the accountants and not to be more Apple-ish.. I dunno..possible? Could be.
For me, i'll stick to a 5 and will buy a spare for the next 3-4 years. There's not enough 'new' to really make me drool over the 6 and without the battery/sd card slot, it's an easy choice NOT to upgrade.