It's ridiculous. I thought I remember someone saying the iPhone 1/3/4 size was designed to be perfect for the human hand and I agree. It's easier to make things larger, it's hard to make them small, how are we regressing?

Unfortunately, you're not going to find any modern smartphone, even a "mini", as small as your 5s.

I personally find the 4.3-4.7" range compact enough, especially if the bezel is minimal.