E2EE will never be the default, because people lose their devices all the time, and don't want to lose message history.
I would rather want a feature, like Telegram has, where you can set auto-delete of all messages older than N days.
Everyone who has to, say, prove that they kept paying their rent for a year without interruptions. You sent a photo of your money transfer from the bank app to your landlord, and he sends the "received" screenshot from his bank app.
Moreover, a lot (even most) people make personal notes by sending messages to themselves.
Most people trust the police. This might not be justified in your state, but most people still do.
"Where were you during the event X? I was very far from the place you are interested in, as can be proven by this photo, sent to my grandma, have a look at the history in her phone."
If message history is important it should be backed up on the receiver's end after decryption, like WhatsApp and signal do.