Another pointed quote from Ushiro on the usefulness of paired "step by step" forms such as those used in aikido training.
Ushiro Sensei wrote:
... bunkai kumite (step-by-step sparring) based on kata as a system for getting feedback about the usability you've achieved. Techniques that take kata as their starting point can be evolved limitlessly. And limitlessness [in terms of what could happen] is definitely a feature of any real combative encounter.