Question: Can we expect to see more basic and essential features exposed to blueprints in the near future, as was revealed in the latest engine preview(multiplayer functionality)?
https://forums.unrealengine/showthread.php?67639-Engine-Features-Preview-4-22-2015
We are still missing quite a few game features to allow for complete blueprint games. Control over config files, the ability to load/save/control files using blueprint(player added assets), steam integration, etc.
Basically there is a whole slew of little things that are pretty basic to publishing a game that you simply cannot do in blueprints.