Summary
- Treat sleep, heart-rate and activity scores as signals whose accuracy changes by device, body and circumstance.
- Users need export, deletion and sharing controls before longitudinal data becomes an irreversible platform dependency.
Wearables can make daily behaviour visible and help a person notice change earlier. They can also turn uncertain sensor estimates into authoritative-looking numbers. The next useful evidence is a validation record for the intended population, paired with a clear path from unusual readings to qualified care. A trustworthy product explains what it measured, what it inferred and who can use the history, while leaving the wearer able to move or remove that record.
