Yahoo's roots were actually in a rejection of engineering.
For years their primary product was their human-curated directory of Web sites. It was popular because the quality of results returned by the algorithmic search engines of the time (HotBot, Lycos, AltaVista, etc. -- you young 'uns in the crowd may need to look them up) were so poor that you had better odds of finding what you were looking for in Yahoo's directory. The directory left out vast numbers of sites, of course -- that was the cost of trying to manually maintain an index of the Web as it exploded in size. Human curators couldn't keep up with that growth; only software could. But Yahoo bet that software would never be as good as humans at finding the site you were looking for.
Then Google came along and built software that could index the whole web and return relevant results from it, and that knocked the bottom right out of Yahoo's manual-curation approach.
For years their primary product was their human-curated directory of Web sites. It was popular because the quality of results returned by the algorithmic search engines of the time (HotBot, Lycos, AltaVista, etc. -- you young 'uns in the crowd may need to look them up) were so poor that you had better odds of finding what you were looking for in Yahoo's directory. The directory left out vast numbers of sites, of course -- that was the cost of trying to manually maintain an index of the Web as it exploded in size. Human curators couldn't keep up with that growth; only software could. But Yahoo bet that software would never be as good as humans at finding the site you were looking for.
Then Google came along and built software that could index the whole web and return relevant results from it, and that knocked the bottom right out of Yahoo's manual-curation approach.