It's not talked enough how tanky the Sentry Bots are
So these tiny bots, that zip and dodge all over the place, and shoot rockets that deal punishing damage, have 150 health? Not even a Hammer Caster can one-shot that!
And the Prospecting Drones pump these out in numbers. They don't even have a weakpoint afaik - not that they aren't weakpoint-sized themselves.