Ever tried to use all the hidden features on the sides and corners? Absolute nightmare with a mouse, fairly reasonable with touch. The UX was very dependent on the hardware being used.
And I hate the bing search bar, too, don’t worry. Never used Cortana, occasionally use the search at the bottom of the screen, only select from installed apps or documents. I already know how to use a web browser, thanks, and they all let me choose my search engine, too.