Off on a tangent, but yes, these are tools. And the tool we use shapes not just the result but what we attempt to do, and how we approach the task. In other words, irregardless of the technical similarities, using a different kind of camera (or camera-lens combination) will give you different results.
As a simple example, if you have a long zoom lens on your DSLR, you will look for, and shoot, very different kinds of pictures than if you had a small, wide fix-focus lens on it. A DSLR will invite different kinds of pictures than a pocket cam, or a smartphone. Switch to a film camera and the limited shots and lack of feedback invites yet other ways to see pictures around you. Go further out and try an old TLR, or a medium-format folder - or a view camera! - and the world will change around you again.
We want to have many different cameras not because one of technically reasons, but because they enable different kinds of photography. Nobody expects the car industry to settle down on a single type of car. Why should cameras?