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Relying on the Eternal Division Wall alone wouldn't ensure Humanity's safety from the hands of the Abyssals.
Sure, after rounds of modification, the Eternal Division Wall was a far cry from what it was previously. Still, it would be foolish to rely on it. At most, it could buy them sometime but it's nowhere near enough to stop them completely.
Hell, Raven's somehow confused that there's really nothing they could do to stop the Abyssals at all.
That being said, giving-up isn't an option. Even though it's futile, so long as there are attempts, Raven can do something about it. Yes, they'd still be invaded eventually but it doesn't necessarily have to be easy, Raven could certainly make it a lot more difficult for them to do so.
Hence, the were the rest of the projects on their to-do-list. Every single project in that forms an intricate set of traps and security measures to ensure that the damage done to Divine Realm remains at the minimum.
