I agree; choices and tinkering add complexity to a search engine, and search engines need to be simple. That aside, a search engine needs to be really focused

I agree; choices and tinkering add complexity to a search engine, and search engines need to be simple. That aside, a search engine needs to be really focused on privacy. Customising it implies that the user needs to log in and remain logged in. I'd much rather no do that with a search engine, and I don't want its behaviour to react to my identity either.