Witness had memory of it and it would've been sick to see it manifested as a zone in the Pale Heart. Massive missed opportunity. Even just a flashback vision upon touching a Dissenter Statue would've sufficed.
I wanted to see the Pyramids arrive and the bleakness and despair Humanity felt as darkness beasts under Nezarecs control ran wild across the Earth's surface as Witness gave some sort of salvation has arrived speech.
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There's some lore about the collapse that makes it sound absolutely terrifying. Like the swamp monsters that rise from the ground and such.... Such a shame we never got anything like that in D2 when the Witness invaded again.