Every single thing and every single person can be seen as a "dice-roll machine"; when I give even a senior engineer a task to take on this sprint, there's a significant chance they won't complete it that sprint (and it might just have been infeasible at all). At the end, all work boils down to the project management triangle (On Time, On Spec, On Budget - choose two), and the better the AIs get, the more tradeoffs we can choose from and the more and more we'll gradually be using them, regardless of whether we'd able to ever trust them to complete a task perfectly 100% of the time.