Not trying to argue one way or another regarding what you said, but I thought it would be interesting to list the search engines present in safari at the moment

Not trying to argue one way or another regarding what you said, but I thought it would be interesting to list the search engines present in safari at the moment, given you mentioned it in your first point. That would be Google, Yahoo, Bing, Yandex, DuckDuckGo, and Ecosia. Also, if you use a third-party browser, you can add whichever search engine that you want. Just checked, and Firefox on iOS indeed allows adding any search engine manually.