Studio photography is a pretty different beast as you always have ideal conditions. I had a wedding outside last year on a cloudy night with only string lights lighting up the reception. I have flashes galore but just getting focus was difficult - I eventually had to turn on the modelling light on a strobe to be able to do my job at all. The ability to use flashes at all is a pretty big advantage of dedicated cameras. Video lighting equipment is great but it kills the ambiance in a lot of situations.

But yeah, absolutely. If you're viewing images on a phone (and most people are), phone cameras are just fine for most people most of the time and they have some distinct advantages, especially for the casual user. If you're going bigger than that the difference is pretty clear to me.