You don’t leave the bumpers out at all times. The decking and furniture are all built from suitable materials to not need additional protection. Phone cases are an anomaly.

I disagree that phones are unique in being fragile without protection, what is unique is that we want to carry them around all day without treating them as delicate. The things we eat off and drink out of often can't be dropped from waste height onto the floor without breaking, the front of the microwave or oven isn't unbreakable glass, nor a laptop, or... plenty of things. We're just OK treating them all as things to avoid dropping.