Comment by fc417fc802

Airline isn't about power consumption but rather reliability. You don't introduce failure modes to safety critical systems unless absolutely necessary.

Meanwhile the power consumption of a few extra packets or even AES on your block storage device is approximately nothing relative to the other things the device is doing. Unless the CPU or GPU is going full tilt the screen on a mobile device consumes more power than the rest of the system combined (not sure about a laptop but it's likely a similar story).

It's a bit like worrying about saving a single glass of drinking water, then turning around and hopping in the shower for an hour. Or not flushing the toilet then immediately drawing a bath.