In practice, LGPLv3 is much different than previous versions of the LGPL. The truth is that many excellent projects have chosen to either stick to not go the v3 route intentionally (because of the extra restrictions), and if they do, several of them choose to dual license under both versions. I can think of numerous projects that are under LGPL v2 (like ffmpeg, GEOS, mapnik, custom webkit) which would cause an amazing suite of iOS applications to surface, but with the current situation, they cannot. Signing is not a requirement of any of those libraries mentioned.
I would emphasize the terms "work that uses the library" vs "derivative work of the library" which have historically been used to differentiate between static vs dynamic linking.
In addition, how would I go about doing this in Android? And how does Apple distribute LGPL libraries (like Webkit) without "[allowing] Joe Enduser [to] replace an LGPLv2 library on iOS"?
