I'd argue that search results trump many of these. The UIs (including mobile UIs) of most search engines these days are virtually identical, although maybe slig

I'd argue that search results trump many of these. The UIs (including mobile UIs) of most search engines these days are virtually identical, although maybe slightly flashier in some cases. No Cuil here. If a search engine offers better results but is a little slower, then that's an advantage over having to flip through pages in a faster search engine.