I don't get it, unless you can reliably draw a pulv and enchant it, steal is one of the only two other perm. control options in the game (not counting mutants). There's no other use for dark quanta, so the only advantage explosion has is meaningless. Nearly every false god in the game has at least one permanent you'd want, particularly those with hourglasses or cc weapons.
edit: not to mention you can usually nab a shield, gravity and dissipation often save my ass when I steal them, and diamond shield turns burrowers into minor nuisances.