So, how do you access the CLI and use sudo to administrate your phones? Rooting them typically voids the warranty, and even then these systems are missing the utilities to create and manage users and groups, and set program permissions.
It is hardly an ideological problem that if one is not the admin, one isn’t in control of their system. If it’s secured by somebody else, including against me as the user and nominal admin, then the technicalities of how they have secured it are more relevant to them than they are to me. Sandboxing is more secure than not, but it is undermined by allowing the apps to leak user data for use by others. The technical problem is how to have finer control of one’s system, rather than trusting all-or-nothing permissions set by the apps themselves.