For the same reason I read a book instead of just the plot summary on the back cover

You really want to read the author's life story when searching for a recipe? Or wade through some content marketing plug for some vacuum cleaner shop in Albuquerque when all you want to do is figure out how to change filters on your vacuum? There are definitely gems on the web out there, but chances are I'm not discovering them via search, and I'd rather get the straight answer from the AI.