Responding at all provides information. If you send a bunch of targets and the enemy is vigilant and attempting to mark all of them and destroy them ASAP, you

Responding at all provides information. If you send a bunch of targets and the enemy is vigilant and attempting to mark all of them and destroy them ASAP, you know exactly how good their detection & response systems are, and, crucially, you'll find any blind spots. If they're ignoring all of them, you learn nothing. If they're responding unevenly (tackle some fast, ignore others), you get some signal, but a lot of noise.