Ok I previously opened this thread here but it was a bit harsh, so I edited it and post it in the XDA Forums. In short, It criticizes Sony harshly for not being able to insure the Xperia XZ Premium the marketing it deserves.
Sony not only doesn't support the device hardware with proper softwares, but doesn't advertise the phone as it should, and pushes it away completely from the huge ecosystem it has like the Playstation.
https://forum.xda-developers.com/xz-premium/how-to/how-sony-fails-marketing-xz-premium-t3651110
Enjoy!
