As a pointer to concepts or documents that *might* be related, it's potentially useful. Vibes based search. In a legal context, the product should be checking whether those docs... actually exist.. before surfacing them.
That's not what's being sold.
We had working search engines and now you get eight pages of chatbot spam sites before the actual content you're looking for, that they're all mangling while chasing the SEO hit. I don't get how it'd ever be more useful than just knowing what keywords you're looking for, old fashioned text search.