Because many people don't yet know about it? As if people read the "feature lists"...
>It is inexcusable that it wasn't previously possible to upload photos to sites (one of what is now the most common use cases for the internet) without involving a native app. The iOS ecosystem struggles to find a middle ground between native and a competitive/competent browser. This feature was no doubt strongly argued by Apple's PMs for many years, but finally they won out over some other dept's PM team.
I seriously doubt this conspiracy theory. How about, they just got around to it? It also took Android a version or two to add the same feature -- and Mobile Safari has been more feature complete AND faster than the built-in Android "Browser" for years, so it's not like they tried to stifle mobile apps.
(As a matter of fact, when Jobs touted mobile apps as the way to build applications for the iPhone (pre SDK), people were frothing at the mouth, demanding a native SDK).
>Camera Roll is ~/Photos + Pinterst-like dynamic grid a la Masonry.
Nothing like Masonry, which is all about calculating and presenting images of differing heights in a non uniform grid. This here is just a grid, something ages older than Masonry and/or Pinterest.