Hello JD,
So you are still running with a dedicated statisticsserver. It's been recommended for quite some time now to migrate to ESS.
The briefest and simplest answer to the question would be that SAP simplified the HANA architecture (one less service to manage resulting is less memory usage and management footprint).
The following notes will help you through the steps to migrate to ESS or increase the allocationlimit of the statisticsserver.
1929538 - HANA Statistics Server - Out of Memory
1917938 - Migration of the statistics server for Revision 74 or higher
2092033 - Embedded Statistics Service Migration Guide
1925684 - ABAP adjustments for the new Embedded Statistic Server
Kind Regards,
Amerjit