Yes, that's deliberate. As others have said it depends on the context and the ease of reversibility / consequence if it's still in use. I see them as complement

Yes, that's deliberate. As others have said it depends on the context and the ease of reversibility / consequence if it's still in use. I see them as complementary. If the risk is low it may be simpler/quicker/more cost effective to turn it off and see if anyone screams. So long as you are listening for the scream and can easily turn it back on. Obviously this can be abused but there are times when it is useful. If the risk is high, definitely spend the time to understand why, even if it is non-obvious.