These 'library' projects were added to Apache Directory Studio at a time where ApacheDS modules were not OSGI bundles but simple jar files.
That's the case now, so we can get rid of this "hacky" bundle refactoring.
The idea is not to remove them from the distribution but to avoid a useless repackaging to make them OSGI bundles now that they are already plain OSGI bundles.
We can now safely use them as is.
Hope this helps.