Durability just gives players more immersion imo.
It is not really a major game mechanic itself.
I do like OP's idea of integrating durability into the combat mechanics. Being able to break specific armor and weapon introduces a whole new layer of tactics.
That being said, it needs to be further expanded on and not be such a simple system. There are some games with Armor/Weapon break mechanics but they end up being mediocre since they're not fleshed out enough.
