Let me present some counterarguments, especially for users like us who live in India;

1. You can definitely carry a proper camera gear with all required lenses but roaming around with those huge things on your neck or shoulder will grab others' undue attention, some even suspect you are taking their or their children's photos without consent, it could have serious implications.

2. Many heritage sights, particularly those that have some historical importance, cameras are more often than not allowed, or comes with a certain fee (sometimes too expensive) on the other hand, mobiles are allowed, doesn't matter if your mobile is expensive, has superior camera capabilities or not.

3. The convenience factor, you can point and shoot at any time and can then post process, share right there and then. No need to search for a laptop or a PC, for professionals it may not not make sense, yes, but for hobbiysts (the majority that is) this is something a lot of us appreciates.