[pederb72]

Then Apple would have to trust that Adobe (or other 3rd party library developers) will never introduce regression bugs in their dynamic library, and never break the ABI, otherwise you risk that an update in a library will break lots of existing apps.

[elai]

That is what library versioning is for. One app uses X version, Y app uses another. The worst case scenario is that it would be just the same as the current static library memory usage we have now.

[pederb72]

All risk could be removed if an app could only use a specific version of a library I guess (even a bugfix micro release can introduce regressions). However, adding support for 3rd party libraries would add quite a bit of complexity to the app store, since each app would have to include information about which external libraries it uses, and when downloading an app, iPhone OS would also have to download all the external libraries, if not already installed.