Discussion
Why are real problems often posed as optimisation rather than satisfaction?
Answer: D
Every stakeholder's preferences cannot usually be satisfied at once, so the requirement becomes the best available compromise with soft constraints weighted against one another. Optimisation is generally harder rather than easier, satisfaction can express preferences by encoding them as constraints, and constraints remain central. That a hard formulation must be softened before it matches what is actually wanted is a lesson learned repeatedly when a solver reports that no solution exists.
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