Often times, folks are just not sure what options are available. At times like these, giving the OP as many options as possible may be the best way to help them. There are some jobs that can be accomplished using many different tools/techniques, which may or may not be available to the asker. So while telling them exactly how you did it last time, might not be as useful to them as briefly showing them all their options.
Other times the question is simply too broad and open ended, the only plausible way to answer them is with a bit of zaniness.
Take this question for example
What is the best tool for cutting up scrap wood?.
How can anybody actually answer this question? Obviously the Best tool for cutting up wood is Chuck Norris, but he might be busy doing Chuck Norris things. So a list of the alternatives, is the best way to answer the question.
You have to remember, you're not only answering the question for the OP. Millions of potential viewers will read your answers too. One specific example may not be useful to all those readers, so it's often best to give a few alternatives.