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Your mileage may vary but the most helpful commentary I have gotten in my life is usually couched in that format: when I am asking for X, but had not considered Y enough, or at all, and someone replies suggesting Y instead, and then I realize new possibilities.

You are right that it does not answer OP's question. I stand by my words, it is still the best comment I have seen. Sometimes it is right to "dont X, X is bad", as it is an opinion which people may freely communicate. I will happily accept my text turning grey for expressing my opinions.

Reminds me of Stack Overflow.