To me its not a question of some technical image quality but more so about expressiveness and the ergonomics of that expression. If you just want pretty picture

To me its not a question of some technical image quality but more so about expressiveness and the ergonomics of that expression. If you just want pretty pictures, then I think iPhone will probably work just great. But if you want to photograph for photographys sake then I feel like phone is still pretty constrictive and unergonomic. It's hard to beat physical dials, buttons, and rings positioned at your fingertips with touchscreens in the general case (admitting that there are cases where touchscreen indeed can be more convenient). Doing something like studio photography with iPhone still sounds like an exercise in pain. While the triple-camera setup certainly is improvement over single-cameras of past, its still only three options instead of the nearly limitless options you have with dSLRs, and you are getting compromises (like losing max iso) when you move off the "main" camera.