I have used dedicated cameras with prime lenses. I quite enjoy using old film cameras as a hobby, including large format cameras which can create extremely shallow depth of field using movements. The only point of the linked photo was to show that current cell phone cameras clearly do not have 'infinite' depth of field (as the other poster claimed).

It is true that a dedicated camera gives you more options. (I did not deny this.)

>You can choose the shutter speed

Pedantic point: you can also choose the shutter speed on a cell phone camera if you use one of many apps that give manual control over shutter speed and ISO.