If every update required a manual power cycle, almost all of the internet would be off, most waiting for one of the far too few technical staff to cycle it back on manually.

Our phones wouldn't wake us up in the morning, as they too would be off.

Shutdown can be a lengthy process.

Bootup can be a lengthy process.

Automatically is the fastest way to do both.

And get back to work.

Is that too many options for you?