They have 2 smartphones

What do you mean “reply to the issues”? You keep making statements which are tangential to a brief, simple point I made. You have not asked me any specific questions, and you have not answered any of mine. Thanks for “schooling” me with wikipedia links.

Yes, basic administration is not in itself a “security model”, but if you are prevented from administrating your system, you won’t be able to secure it anyway. That is the whole, very simple point. It is not meant to be a detailed history of operating systems or security models.

How is controlling one’s Android system an ideological rather than technical problem? Perhaps some ways in which trust models are defined have a component of ideology. But once that has been decided, how does one implement and enforce them on their phone, technically? Do computer security professionals explain to their customers that “Since you accept that there are back doors into your system, your push to have them patched is your own ideological problem”? I can imagine that would go over really well.