They did add an option to repair them in TOTK. If you let a rock octorok suck them up, they spit it out fully repaired. It can be a bit of a hassle though especially when you can only do it once per octorok until the next blood moon. There’s also going to Tarry Town and having your fused item separated from the weapon without destroying it if it’s something particularly rare, but that doesnt change how much durability the weapon itself has left.