XZ Premium: Did Sony Make a Mistake? (& True 4K Mod)

Sony produced a 4K phone but keeps it at 1080p MOST of the time! Is this a rip off? Is it a mistake? Or does it make sense? These are my thoughts and what I think Sony SHOULD have done.
Thank you to http://www.clove.co.uk for lending the phone!
Install adb here: https://forum.xda-developers.com/showthread.php?t=2317790
Read more about the mod: https://forum.xda-developers.com/xz-premium/themes/mod-change-default-resolution-to-4k-root-t3618843