Earlier quoted context omitted.
From parent comment: > This configuration would also need to be sharable, maybe something akin to an App Store, because not all users can be asked to be technical enough to configure everything.
That's still configuration. Sharing a config? Asking a friend for the best search algorithm? Most users are accustomed to just typing in their search query into random input fields and getting perfectly serviceable results.
Or, as with any other software, there's this thing called a default, which usually works for the average user.