Durability has no purpose.
Doors that are worth breaking are unbreakable, chests when broken drop less/nothing so the cost of breaking them is already there, and it serves no practical purpose on armors.
Instead of durability and repair hammers, we should have a Disarm and Disrobe status/effects that allow an enemy to strip your gear(forcing AP use to re-equip), and Crowbars that act like super-lockpicks(rare, but require no skill to use).
With Crowbars in game, no door should be breakable through damage.
