Earlier quoted context omitted.
This is not about a single search engine instance replacing all your search engine needs. There could be a community of Software developers running one instance of the OS search engine that focuses on programmers needs: documentation, vcs hosters, dev blogs, tech news websites and on topic blogs. Great if you need to search for how to solve a software issue, terrible if you need to figure out how long to cook spaghet…
This is the single suggestion that got me excited, instead of a behemoth do-it-all engine, have focused search engines. Exciting idea.
I find it helps when looking for obscure info on random topics.