Sports Photography, needs an SLR, Fashion Photography, Medium Format, Landscape Photography a Large Format Camera.
These used to be the rules, but then digital happened and the rules changed. Modern digital SLR’s surpass in resolution the old film Medium Format cameras and come close to rivalling current digital Medium Format cameras.
Today it can be more about choosing a camera you enjoy shooting with then choosing the ‘right’ camera.
But somethings are easier with the appropriate camera, and you would never consider using a Black & White only rangefinder like the Leica Monochrom for sports photography. In the link above that is just what somebody has done and a great result to. The top photograph of mine was taken by a Leica, also not a choice for wildlife photography.
It is surprising sometimes when a shot comes up, you use what you have with you.