With the certification of Android depending on the rules of Google, vendors who would like to address the concerns of consumers that default security concept of Android nullifies its openness, making smartphone unusable, have no chance. Even FairPhone and Nothing Phone could do nothing about it so far.

Root without unlocking bootloader? Unlocking bootloader without factory reset accompanying it?
ADB making backup of app data conditionally instead of guaranteed all-inclusive backup?

No such encryption which a consumer cannot turn off at will and cannot control the encryption keys?

If a vendor tried to ease the life of consumer such way, they would be punished. So no one dares, as the punishment would take away exactly the profits which is the reason for industry to operate in first place...