We've recently upgraded to 10.6.1 and found out that ESRI is moving users to use the Relational Data Store. However, we've also come to realize that you can't "see" (i.e. attach to Data Store and write SQL query) what's in the Data Store. As a HIPAA covered entity, I don't believe we can in good faith use this technology with these limitations. In some ways, we're wondering if ESRI is moving backwards (i.e. back towards proprietary database technologies). I understand that the Data Store backend is PostgreSQL; however, I'd like ESRI to add functionality so we could browse the Data Store in ArcCatalog and/or allow us to attach to the PostgreSQL Data Store and query using SQL.
Until this happens, we won't be using the Relational Data Store.