More penny pinching from Apple. (It's the 5c all over again, seriously.)
All things being fair, the entry level iPhone in September should have been a 6, with 6s and 7 as the other options.
Everyone laughed when Apple went for the plastic entry level phone instead of the metal 5. But 2 years later, nothing but praise for 'another 5' with relatively similar specs.
The 6 is barely bigger than the 5, in the hand, with the 'added thinness', and in 2016, the 5 body is so outdated it's pure penny pinching to foist that on the poorest of iPhone aspirationals. I see a lot of normals still carrying a 5, though. They ain't broke, so who needs to replace them? I spoke with my cousin and the faster speeds or better camera of the SE held no attraction. His 5 is working fine for him.
All that said, the 5c was a cooler phone. Plenty of 5 owners wanted to trade 'up' to it because the colours were cool and the plastic case was more practical. If it HAD to go that road, Apple should have at least gone the 5c case with updated specs.
Sure the echo chamber would have laughed at the plastic case, but in practice it would have been a better deal for customers, even corporate buyers (the majority of entry level phone buyers, I'm sure), who could have saved buying a case.