For legendaries in general, I want to refer back to @Croms_Faithful’s suggestion that different legendaries come from different biomes. Since we cannot repair the weapons at all anymore, I think it would make sense that the general legendaries that come from chests should have a limited biome where they can be found, thus decreasing the RNG aspect, at least by a bit.
But I do agree that the torches should be an exception. I don’t have either of them myself but I can’t see the harm in either making these repairable or making them last eternally and just removing durability from these two items.