Often my family and friends ask me why I use my cellphone to take pictures when I have a big camera with me. Inevitably the next questions are if / why I prefer my phone and if the quality of the pictures is comparable. Sigh. I would say that the use of a camera depends on the moment.
You don’t always have a DSLR with you, but often enough a cellphone is all you have. At the same time, a cellphone’s ability to waste your time to find the camera app, start it and wait for it to initialise the camera in the cellphone may make you miss the moment.