Everyone interested in realistic character animation.
Physically accurate animations are not easy to make. Even something as simple as a falling dice requires a lot of effort. The purpose of Cascadeur is to make it possible to create physically accurate animations with only keyframes, without relying on simulations or motion capture. If you are interested in realistic animations, this is the solution for you.
But even if you are not, Cascadeur is still very much capable of creating traditional character animation.