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My phone will reboot randomly; depending on what layer the reboot happens at, there may be no flush command sent to the card.

No worries, I checked it a few minutes ago, and android doesn't support this either.

> and phones also don't suffer from sudden power outages,

Phone batteries die, and the battery remaining percentages are only an estimate so writing code to react to that condition can be fickle.

> and phones also don't suffer from sudden power outages

Perhaps you have never dropped your phone, but in my experience, on a dropped phone the battery cover and the battery often go flying.

I will say that at least most flagship phones these days have internal batteries.

Flagships have been skyrocketing in price and are losing marketshare to the midrange segment, which almost always has removable storage, and often has a swappable battery.