[Sanddancer]

The lenses your phone has, made by the lowest bidder, will not match a good zeiss lens, or even soviet lenses. You'll also be stuck with whatever the phone maker has decided is a good enough aperture because there's not an easy way to change the aperture size on a device that small. So the depth of field will always be exactly the same. No tiny apertures leading to crisp fields where everyone's in focus, no wide open images where the one, and only one, object you want to study is in focus. So yes, there are quite a few justifications for a discrete camera even after phones fix their processing delays. A smartphone will displace the snapshot camera used 10 years ago, but it's not going to be physically possible to replace the versatility of a changeable lens camera.