> Root access refers to the highest level of privileges a user can be granted to a computer system.
This is no longer true. You might have root access on your smartphone, but you still don't have access to the TEE (on ARM this is implemented using the "TrustZone" "feature").
Also, AVF is coming to Android, and protected VMs won't work with unlocked bootloader.. so expect the situation to deteriorate further once manufacturers make use of pVMs..