In my opinion, Dgraph is about the be in the “State of the art”. There are some really small things in Dgraph I personally think we have to fix or add as a feature. And no feature as “business Logic” will be required if the user learns for real the query (DQL, GraphQL) he has available.
DQL has the potential to be “The Query”. The big sister (younger but bigger) of the GraphQL can beat any other lang. And they working as pair can be overkill.