How to implement complex game systems with ECS (And even should I do this)?

[xahon]

Managing single valued components and react to changes looks nice and easy but what about more complex logic that usually every game out there have to implement?
For example, I want to make a character controller for my person which can walk, run, sprint, crouch, climb walls, jump from wall to wall, etc.., is it even feasible to put it onto the ECS or should I stick with old good MonoBehaviours for implementing this stuff?