The accuracy is a big part of it

Saying "We heard something in that multi square mile area that may be worth looking into" is way different than "We know exactly where and what it was"

And how quickly they could definitively identify what the sound was and where can play a big role in identifying capabilities of the systems at play and the how advanced they are

And of course knowing capabilities is a key part in developing systems to circumvent such systems

Basically what I'm trying to say in entirely too many words is that specifics matter a lot, especially to the military. And specifically knowing what someone is capable of can be used as a way of getting around it or using their own systems against them. Especially so that you know you're not investing in systems research that is already defeated by anothers systems.