So I'm wandering around a Dissonant Planet in my Minotaur, collecting Inverted Mirrors and Echo Locators, and I happened across a Sentinel Control Pillar.

I was able to destroy it by taking out as few of the pods, hopping away, letting the heat die off, and going back.

Despite the fact that the Sentinel forces are disbanded, or whatever the term they use is, the Dissonant Resonators don't go away. But the really fun part is that the Sentinels apparently don't just disappear, they fall dead. I have found a few dozen combat supplies just walking around areas I hadn't been before. These aren't ones I missed.

So in short, I can destroy the Dissonant Resonators with no penalty, I can pick up Gravitino Balls with no penalty, AND there are friggin' Combat Supplies littered all over the planet now. I'm gonna have to use those maps that pinpoint the towers on my next few planets for sure.