This is a big problem though, and is part of the reason why the story of Shadowlands portrays the First Ones as stupid: they created a flawed design, knew how to rectify the design, decided not to do so, and instead left the components behind for someone else to update the design which they already knew how to do. It's not an instance of "the design was flawed and would eventually need to be improved," but "they intentionally introduced flaws into the design they knew would precipitate change, knew what the change would be, but opted not to implement it themselves." It would be reasonable if this came off as the Shadowlands evolving in design, but we have indications of this all being preplanned by the First Ones, which means it's not iteration. If this were simply iteration, then the results of the system would have been used to influence the new system, and while it is this case so far as the mortals are concerned, but we know in the meta that the First Ones already knew the outcome of the system. All the First Ones have done is add in unnecessary layers of contrivance to the universe when we start to drill down into their actions, whereas the Titans typically had some goal they are working to attain (which may have flawed implementations).
If the First Ones were like the Titans and made creations that were to develop by themselves, just with failsafe mechanisms, that would be fine. What we have are omniscient beings who intentionally induce flaws into systems, know the outcome of these flaws, and know how these flaws will be rectified in the future, but do nothing. Blizzard's decision to have the Oracles in Zereth Mortis, and to have all the events of Shadowlands being a huge prophecy, has basically buggered the chances of the First Ones being as accepted as the Titans were.