and you can say good buy to.
your email app from being able to see any office files.
When you drag from the file manager or Office to your e-mail program, the operating system would make a read-only view of the file in the e-mail program's space.
no more flash , java , quicktime and more on the web.
Three words: good fcuking riddance.
adobe apps can't work with each other
Having been published under the same private key (that of Adobe Systems) would let them run in the same sandbox, if the model you envision is anything like the model of Android.
no more visual pinball working with pinmame (at least both are open source and can have both join to one app)
They could join through more structured data sharing mechanisms, such as local sockets set up by firing an intent.
IDE / codeing apps may be come hard to do.
Console gamers and iOS fans would say "good riddance". But they could work the same way AIDE does on Android.
No more NV or ATI driver apps
Again, having been published under the same private key (that of NVIDIA or AMD) would let them run in the same sandbox.
games can't have mods or map editors.
Console gamers and iOS fans would say "good riddance", as I described in another article, because modding helps cheating. But a mod could be installable through the same share mechanism I mentioned above.