As an enterprise system, please allow all ArcGIS Data Stores to use UNC paths for Relational/ Tile Cache/Spatiotemporal Big data stores and allow duplicate item names.
Reading about ArcGIS Data Store it appears to be a different options depending on the type of data store.
Also, I'm thinking maybe the 10.5 release of ArcGIS Server was mistakenly coded to act like an ArcGIS Online subscription where I noticed in a recent ESRI MOOC two users are not allowed to name something the same (Organization-Wide).
Reading more about ArcGIS Data Store 10.5, it seems like everything will get tossed into a single schema in the back-end.
Reading about Pro 1.4, it is currently not able to publish directly to an ArcGIS Server into its separate ArcGIS Server folders - It publishes directly to Portal for ArcGIS which then creates all map services in the root folder of ArcGIS Server. (Federated that is)
That would match the behavior of not allowing duplicate feature class names.
If this is correct and intended, it is a huge restriction to put on enterprise GIS/geodatabases.
A show stopper of sorts for ArcGIS Enterprise 10.5 at this time until workarounds and/or new supported ways of doing things are figured out.
Production & Test schemas:
Production schema with feature class name ALPHA.CITY_LIMITS and one field name AGENCY_CODE
Test schema with feature class name BETA.CITY_LIMITS and two filed names
Please make adjustments as needed to not force customers to completely change proven production workflows with ArcGIS Enterprise.