Discussion
What is the practical modelling advice that follows?
Answer: A
Adding implied constraints, using global constraints where they apply and trying alternative encodings, then measuring, is how industrial models are developed. Minimal models propagate poorly, global constraints are the strongest tool available, and variable count is a poor proxy for difficulty. That the advice is to add rather than to minimise runs against most programming instincts, which is why it has to be stated explicitly.
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