Comment by spookthesunset

I mean the Apple hardware in question is usually a laptop, which has its own very well instrumented battery backup. In most cases the hardware knows well in advance if the battery is gonna run dry.

And yes the hardware is failable. But the kind if failure that would cause the device to completely lose power is extremely rare. The OS has many chances to take the hint and flush the cache before powering down.

Note: this is pure conjecture.