I learned back with my Galaxy S4 that no one owns any Samsung product. Samsung really retains control. The so-called customer just has a license to use it for a while.
I wanted to put on a different version of Android, and Samsung's Knox software prevents modifying the bootloader, so I'm stuck with all the Verizon bloatware and limited functions from their stock software, such as no tethering.
That's why I went with the more open ZTE as my current phone since it's made by the more open Communist Chinese.