We tried to add it, but as selfservicing's logic is distributed internally, it was very hard to add it to the existing codebase. In adapter, all queries for the entity graph are in the same adapter, in selfservicing each entity in a graph takes care of its own persistence. We had to refactor too many public APIs to get there so we abandoned it for selfservicing. I don't think we'll be able to add it in the future as the APIs we had to break won't go away, sorry.