In fact UserManipulator dependencies do not harm boot and it is not only because we thought that it was the case that the subscriber is dependent on the DIC. but also for lazy loading purpose because are you sure that 

- instantiating all these objects and the dependencies of these objects.. etc .. see [UserManipulator Constructor](https://github.com/alchemy-fr/Phraseanet/pull/590/files#L4R45).
- for each request where the EntityManager is needed.

is not worst in terms of memory ?