Today, all modern browsers have a unified address and search bar (including Safari on the Mac). What Apple calls a "Smart Search Field" has also expanded beyond the typical search and go, as it looks through your history, previous searches, and sometimes even the content of pages that you've visited. Unifying the two fields also has the potential to speed up the browsing experience; you can't accidentally tap on the wrong bar. I remember when I first started to use a unified bar on Google Chrome, the experience just felt infinitely more simple and straightforward.

One of the obstacles to this unification is the unique keyboards that appear when the user taps on one of the two fields The search keyboard is pretty typical, while the address field's keyboard is built to type URLs. I had to dilute the individuality of the boards in order to make them come together. But, in the end, I think there is a net gain to the average user.