It is actually hard for people to take precautions on their personal information especially that which concerns to their privacy keys, I don't see how someone should be that foolish enough to store their personal information on apple iCloud knowing to well that information could be leaked or expose. Of course,. offline is the best place to store their seedphrase jot it down and duplicate them into various places that you alone has access to it than having to store them on one personal devices.
This world is still full enough with foolish people who never try to understand risk and always put things in places where they always have a chance of loss or theft despite the danger of life being ruined, and they will never be able to recover this after once lost. I learned the first lesson: not your keys, not your coins, because there are many stories where people lost them due to just not taking precautions.
Never trust any online store or place with your privacy because they always have flaws, and this could always have a chance of giving you losses. Always keep your things under your own control. Securing things offline is always recommended because this gives a better way of security, and also use different methods because risking only one is also problematic. Having a duplicate system will increase security.