I think the main problem with this approach is the UX: that all the things we want useful information to be are pretty hard to do in a text search phrase: What

I think the main problem with this approach is the UX: that all the things we want useful information to be are pretty hard to do in a text search phrase: What makes librarians so great is that you don't walk up and just say "Byzantine empire tax rates" to them, you have a conversation about what you're trying to do, with tons of context, and all their amazing experience.