And then they reveal they are in fact recording every moment of their lives with at least audio if not video too. Ideally also measuring the air to replicate smells later if desired.

If such was cheap and easy, I'd do it 24/7. I hate that my brain's storage is so volatile, and I wish I remembered dead people better. But yeah GP is still a good point, my desire is a separate issue from not wanting one's efforts to 'go to waste' by not being preserved. An honest introspection will reveal just how much is 'wasted' all the time from that point of view, it's far more than just ephemeral updates or unrecorded and unremembered speech.