Lots of RPGs use an equipment durability system, but most of the time, durability never quite feels right. You're in the middle of a quest, and you've brought your favorite sword. Eventually, your sword starts to dull. You either burn through a repair tool, check in with a smith in town to get it fixed, or switch to one of the other weapons you're carrying and press on. It doesn't make the game any more difficult or deep, but it's built into the gameplay loop anyway, seemingly just for the sake of it.
Zelda: Breath of the Wild also features an item durability system, but it does so in a much more thoughtful, purposeful way—such that durability is actually an integral part of the overall game balance, and it makes Breath of the Wild a better open-world game.