Strongly agree about the deterministic part. Even more important than a good design, the plan must not show any doubt, whether it's in the form of open question

Strongly agree about the deterministic part. Even more important than a good design, the plan must not show any doubt, whether it's in the form of open questions or weasel words. 95% of the time those vague words mean I didn't think something through, and it will do something hideous in order to make the plan work