Here's my unpopular iPhone opinion:

The mute switch that most of my colleagues say "is great because you can feel it" is terrible. When you keep an iPhone in the case, nobody can "feel" whether it's on or off. I keep my iPhone in a leather case and the switch is completely inaccessible to me. It's a horrible experience.

Bring on a new button that is easier to operate and plays a haptic pattern depending on what it does.