Well, exactly. And you'll find Super-F searches on-disk files exclusively. The dash has had a network components to many searches from the start - notably in the music and video lenses, for example. It was including Amazon in the Home search that sent RMS into apoplexy. Perhaps he has an issue with Amazon at large.
At the end of the day, the core issue is a user experience one. What does the average user want when they search "everything". We think that is undoubtedly an expanding set, that will include, well, everything. RMS and others feel that the user should specify that exactly, search for search. We feel that will lead to an EMACS style user experience ;)