[traceroute66]

> I assume lawyers could benefit from a tool that can summarize a large document rapidly. They’re often faced with thousands of pages of documents, and in large class actions possibly hundreds of thousands to millions.

That tool is a human called a Junior Associate.

And, no, you cannot replace a Junior Associate with AI for the reasons already outlined by @kkielhofner below. TL;DR: context... Junior has it. AI doesn't and will never do.