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In Europe we mostly rely on the indicator. If you are unsure, you just try to open the door, and you will see if it is locked or not. When it is locked, it is obviously occupied or out of order. No awkward shouting or other kinds of human interaction needed, so you can shit in peace.

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One of my pet peeves is people who rattle the toilet door before checking the engaged indicator.

That's intentional. By doing so you are interrupting the occupant's peaceful moment, make him anxious, and as a result he will get out faster.

I thought it was so that the occupant had warning in case the lock wasn't properly engaged.

Or slow the person down.

Usually it's not possible to close the door flush without locking it, so an open stall will have the door ajar. People only push on the door when they are all occupied.

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