That's true. The same argument can be made for any system that is put in place, though. Even the current one likely has types of discussions that "break it" in some way. There's even evidence of such breakage if you include arguments/bickering as something that the system should prevent.

We can summarize this change as moving from a system where (at least some of) the system's weaknesses are known, to a system where the people running HN believe it should be a better system, but it still probably has points where it breaks in some way. Doing changes like this and reacting to breakage is the only way that progress can be made.