As a note, loads of people don't like how the addon disables the posts tab.

Personally I think it is a good thing (gets rid of bloat, and posts search still available), but we'd better make it an option.
EDIT: Hidden option in v10+, 'activities_and_posts'

Nah. Since this issue was created we've been more trying to remove stuff from bundled. Facebook used to be, for example, and is not now - and in fact that has been improved a lot outside bundled.
If we have too much bundled it's too much of a learning curve, and biases the product too much (Composr is not intrinsically its own social media platform, it is just something it can be).