I think that it was an interesting angle to make many species the direct product of titan seeding and meddling with many our origins beyond the stars as creations of what might count as near divine alien intelligences.
It just falters when even the fundamentals of physics and the afterlife came out of a machine, too with no indication of higher forms. The First Ones might as well be mythological with this lack of context.
Physical life begets a soul, apparently and that soul has to go somewhere. Why you’d make an elaborate system of judgement rather than a recycling system and a trashcan for the absolute worst is the mystery.
Then we have the Void lords who are “outside the cycle” despite apparently having seeped out of yet another engine and what the heck are we to make of the characters that apparently beat death?