Lockpicking is not a good reason to keep it - there are still lots of ways to go past the limitations. Sure, chests are resistant to elemental damage, but there are spells which do physical damage. You can just teleport that chest back and forth. If that's slow - well, just burn it until it has low hp, then teleport it so there's no fire when it finally breaks. And even if weapons get dull - you're literally drowning in non-enchanted weapons that cost almost nothing when sold. You just use those as improvised "lockpicks".
Durability just adds nothing but chore to the game. Especially now that the hammers are finite.
