The shivans are the symptom of a bigger problem. This is true since it came from V, but there's nothing to build off of it. In fact to the community being told this means nothing. No one can do anything with it. It's stupid like that. And get's even dumber with the shivans being the "galaxy's immune system". Shivans are just another species like terrans and vasudans. Vasudans and terrans have a lot more in common with each other than say something that's completely alien in all respects compared to them which is shivans.
Shivans being the great destroyers wiping out other races that are capable of subspace travel. Get's really dumb and pretty pointless calling them the great destroyers calling out for the annihilation of your species just because your people have a couple of star systems and can go elsewhere in the universe because of subspace travel. Even if your species put less developed species in shackles and servitude, the shivans get deified as the great destroyers because there so ****ing alien that anything the species that's going to get annihilated considers standard will not work with the shivans. That's why standard communication can't work, body gestures, anything (especially in person diplomacy). Shivans are native to space, vasudans are terrans come from habitable planets. Terrans and vasudans come from gravity environments and use sound waves to communicate. Shivans live in zero-g and use quantum pulses and communicate (there's no sound in a vacuum). So this also equates shivans not having ears to hear sound, if you evolved in a vacuum the evolutionary process is not going to give you ears that hear sound. Shivans having their own version of ears might as well be compared to a miniature radio antennae that receives signals(being able to pick up other shivan quantum pulses) and a radio broadcasting antennae (a shivan being able to send it's own quantum pulses). The fact that shivans use quantum pulses to communicate in space makes perfect sense since there's no sound in space, and shivans will certainly not hear what any species has to say until bosch came around. Also the fact that shivans have tons of limbs in an odd configuration makes them pretty alien as well, the compound eyes could be compared to spiders i guess. So screaming at a shivan is as effective as a shivan sending quantum pulses to a human or vasudan (no one can hear each other).
Shivans aren't a force that the universe sprung on everybody who's space capable in the universe. The shivans are not a force of nature or immune system. This deifying comes from the ancients making the shivans seem god like in the first place, and then vasudans and terrans not sure if they should think of the shivans as god like or a force or nature.
Shivans are yet just another species in the fs universe. Sort of like how terrans and vasudans are species as well. But, just like how some species have some things in common (sort of like chimpanzees(terrans) and orangutangs(vasudans)), some species have nothing in common (sort of like how orangutangs(vasudans) and chimpanzees(terrans) don't have anything in common with say a spider (shivans)). The shivans can still be the symptom of a bigger problem, but not as a force of nature or being god-like(that's the gayest thing to hear for what the shivans could be), the shivans could be the symptom of a bigger problem say if the shivans are being bothered by something major and this in turns ends up making the shivans bother other species (just an example).