I build a safety-critical Android app that monitors elderly people living alone. It watches the phone 24/7 — motion, GPS, screen activity — and emails their family when something looks wrong. No buttons to press. No wearable to charge. Install it on your mum's phone and forget about it. That last sentence — install and forget — is the entire product. It is the only reason this works for the target user, who is 65+ years old, does not open apps she did not put there herself, and will not read an email from us telling her to go into Settings and tap anything. If the app needs her attention to keep working, the app has failed. In the last two weeks I found out that Android does not want me to keep that promise. What broke first: the app was too quiet I shipped a build. A tester installed it, went through setup, and never open the app again, exactly as a real elderly user would.…