The problem is it needs world knowledge to know what to lookup. This puts a floor on how little it can know while being able to look up what it doesn't know. Maybe its better if it knows a lot but has a good instinct for verifying that.
How do you actually get to the thing you're looking up? The scrapeable internet is shrinking in response to scrapers.
"Source: rare book ingested and shredded by Anthropic. No, you can't look it up and we can't show you the scan. The remaining open market copy is $5000. Trust me."