Given how _poorly written_ a lot of real legal documents are, I would definitely not trust any current AI to summarize it accurately. How would it handle documents where terms or clauses are in conflict, or any other situation where a close-reading human would have to step back and say "okay, this is _semantically_ impossible?"

I could see a tool like this being valuable as an outline generator for long documents, but I would be very reluctant to believe any statements it makes about the actual legal effects.