But if you're fighting a big strong fighter-type, there's absolutely no chance of him failing the save (except on a natural 1, but if you find yourself depending on those, you're playing the wrong game). And, let's face it- at higher levels, 5-30 damage isn't too much to a big tough fighter (especially with high-level Clerics, or, even worse, Fighters with Fast Healing). A sword, however, is going to have considerably less hit points than said Fighter, and in almost no circumstances can it recover hit points during a battle. Not only that, but it's going to be much easier to his, since it doesn't benefit from +5 Full Plate or a +5 shield or a +5 Amulet of Natural Armor. So, since even a Longsword can have (at most) 58 hit points, a couple well-placed Disintegrates, regardless of whether he makes the save or not, will even destroy a +5 Adamantine sword. True, you don't get it as treasure at the end, but it's going to be much easier to kill than the wielder, and the ex-wielder will (in most cases) be much more harmless without it.