John Gruber, writing on Daring Fireball:
Couldn't agree more with him. I can't tell you how many of my colleagues and family members have come to me due to issues with upgrading to iOS 8. Every time it's an issue of storage space. They've all purchased either an 8 or 16GB model iPhone, and now they don't have the capability of upgrading, even after just casual usage.
Suddenly, something as simple and wonderful as taking photos or videos with what is now their main camera and center of their life is a frustrating experience, as they need to manually manage this storage just to get enough space to apply the update.
"Why not just plug it into a computer and update via iTunes?"
I counter only with this: "I've never synced my phone to the computer before. How do I do that?"
It's one of those rare moments where things that used to "just work" aren't just working anymore, and that's troublesome.
At this point, I don't see a good rationale for why new 16GB iPhones even exist.