To paraphrase an old notion, The best camera to use is the one you have with you.  Most people will understand there are times when an opportunity for a terrific photo will just happen. The story of Moonrise, Hernandez, New Mexico by Ansel Adams certainly attests to this. Most photographers I know, as well as myself, rarely carry around full size cameras on a daily basis, but we all carry smartphones. Whether or not Phonography will overtake full size cameras I don’t know, but at this stage in their development they are capable of producing extremely professional images.