I'm not clear on things people have said on the Wracking : was it a beneficial or a negative event ? I mean, while it has been said that Elder Sid are valuables assets to deal with threats from without, they were also depicted here as one of the thing which make Creation fucked from within. Preserving a Creation where it's not worth living, for all or at least most people in it, doesn't strike me as the way to go.
...Both.
Better for Creation in the short term - elder Sids are there to cut down threats. But the entire Vision of Gold/Vision of Bronze thing showed that the world would never be safe. The elder Sids goal of keeping creation safe is through the Immaculate Philosophy - live out your shitty live and reincarnate into a better one (A Terrestrial Exalt) if you were karmically good. It's bullshit even in universe - the Lethe wipes your memories and souls are recycled. It was used to keep people in line with what the Sidereals wanted: stability. If people reached above their station, they'd attract the Solar exaltations and be able to affect Creation on a far grander scale, disrupting the peace. So the religion was created to keep these people marked as demons and hunted down and killed. (IIRC it even forbid communicating with the gods, who would probably have been pretty ok with telling people what was up, and probably would've been a pretty big help on the whole civilization sucks thing)
Preventing the Wracking lets more of these people survive and (probably) be opposed to the Solars coming back, especially since the Usurpation was like..the best option they believed they had. They didn't know if it would save reality, but I'm nearly certain the core book said that they decided it was their best choice - a diminished, but stable, creation.
On the other hand, allowing bad stuff to pass, you have a crappier world, but less opposition to handling your goals. You don't have the heavens and the earth, pulled by invisible Sidereal strings, aligning against you quite as hard.
It really is just a crappy choice either way. I personally think allowing it to happen helps you out more long term, but there's no denying that a stronger Sidereal presence helps out the intervening years substantially. It just sucks for Ulyssian, since he is pretty much the anathema of anathema with his goals.
Sorcery have Odyssial making stuff and even for him making somethings that in someway will last thousands of years takes time.
