I agree with the sentiment of this, but it makes one major assumption that I don't think will pass muster in the long run: that people generating output care enough themselves to do it "the right way". Many don't and never will.

Low-effort content mills will never, ever care enough to generate more accurate, consensus-based output, especially if it adds complexity and cost to their workflows.

> That kind of structure seems more scalable than adding disclaimers after the fact.

Not if your goal as a business is to churn out slop as fast and cheaply as possible, and a whole lot of online content is like that. A disclaimer is warranted because you cannot force everyone to use the kinds of approaches that you're talking about. A ton of people who either don't know or don't care what they're putting out will inevitably exist.