Imagine how cool it would be if iPhone had a silence/mute button that actually worked?
Instead it has Silent Mode, and it has Volume. If you don’t want to make any sounds, you have to turn both off. Each one of them separately would turn _some_ sounds down, keep others, and you never sure which would be which. So yeah, every time I _have_ to do both. And then undo both, if I want to hear sounds again. Great, isn’t it? It just works.