Ask HN: What is iOS's biggest security risk?

What's in your opinion the biggest security flaw / risk in iOS devices that is exploitable to either read your local data from apps, or spy on users. without starting a debate war, is Android safer and why ?

reflecting back on San Bernardino on how the FBI made a big fuss about apple refusing to give access and how so easily things got buried under the carpet as soon as the FBI "found another way" around it, everyone seemed to be relieved. My question is what security flaw did the company the FBI hired exploit and what would you do if you were at apple to prevent it ?