Endgame everything is based on random chance, to the point that Nilaus "ended" his playthrough by saying, "Well, technically I've won, but I'm not going to run this for however long it takes to actually get the few components I need."
There's an RNG feature added, a sort of rarity for crafted items. But Idk if the same dev is responsible for this feature and to me it doesn't seem that annoying and completely optional.
They made all the endgame products based on chance. You'd set up the reaction and there was like a 96% chance you'd get nothing from it, or the wrong things. It took so long to get the right things that Nilaus gave up