The AI can't make a reliable judgement, so now you have to hire 3x to 5x more to make those judgements if you have the documents coming in at 3x to 5x faster. Or you'll have one severely overworked lawyer. It's the same problem developers have with thousands of AI generated PRs. Just because you speed up one thing doesn't mean the whole system works faster, and yes a human really does need to be in the loop or you end up with even bigger problems, and lawsuits.

No, that'd only be true the judgement was the full work. If the judgement was 33% of the work and the rest was just old plain e.g. typing, that is now fully automated and instantaneous, then you automate 2/3 of the work, getting 3x in productivity.

Why can't it make a judgement grounded in real data points - then the human can accept / deny that proof much quicker?

Surely there's a middle ground / this is faster than reading all papers front to back.