Samsung Electronics has posted a news item to announce the fact that mass production has started on its 1 TB embedded Universal Flash Storage (eUFS) solution. The 1 TB eUFS has been measured producing a sequential read speed of 1000 MB/s and a sequential write speed of 260 MB/s. As Samsung carefully points out, this makes it faster than a typical SATA SSD.
https://www.notebookcheck.net/Samsung-officially-announces-mass-production-of-1-TB-eUFS-smartphone-storage.401711.0.html
1TB storage makes most sense when one wishes to use LinuxOnDex extensively and the storage is shared between an Android and a Linux instance.