During the testing of early releases of SharePoint 2016, the core Business Intelligence features did not exist. Some of the basic components existed but things like Excel Services were removed from as a core component. In fact, Excel Services is now part of the new Office Web Apps Server called Office Online Server, you can get it back connected to SharePoint 2016 which is important if you use that now. However, there was a shift this version of SharePoint, back to SL Reporting Services for On-Premises users.