“Root cause” is relative. To the CEO the root cause is “some engineering thing broke.” To the data engineer the root cause may be that a human config error led to a rogue process that caused a VM disk to fill up. To a quantum super-intelligence the root cause may be that in Everett Branch 2765425 atom 67896533 collided with atom 78532578.

(Just kidding. The space of Everett branches is not countable.)