That wasn't the guys only criteria, so you're strawmanning them to an extent.
Even putting that aside though:
People who know what they're talking about write books. Oh not all of them, granted, but there are so many humans publishing so much stuff - so many of whom will be experts - that it makes at best limited sense to listen to anyone but the best. The world may be predominantly full of nobodies but that makes it a sorting problem.
Indeed, you could argue that for some literature the search data is rapidly becoming more important than producing anything new for a similar set of reasons.
Even putting that aside though:
People who know what they're talking about write books. Oh not all of them, granted, but there are so many humans publishing so much stuff - so many of whom will be experts - that it makes at best limited sense to listen to anyone but the best. The world may be predominantly full of nobodies but that makes it a sorting problem.
Indeed, you could argue that for some literature the search data is rapidly becoming more important than producing anything new for a similar set of reasons.