The problem is that humans are badly suited to remaining attentive in these circumstances. Take the combination of “overwhelming amount of output”, “99% of the time it does the right thing in the right way” and we are basically wired for vigilance to flag.
It makes me admire people like Linus Thorvalds. His job is mostly to read code and stay on top of the contributions of many people. I don’t think I could do that.
It’s easier to remain vigilant when a large part of the contributions are bad or incorrect than when it’s a very small percentage.