You should be sure that "rewriting from scratch" is going to give your users some concrete benefit that will make them like your site even more, and you should be sure that "rewriting from scratch" is the easiest way to give your users those benefits.
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Why?
You should be sure that "rewriting from scratch" is going to give your users some concrete benefit that will make them like your site even more, and you should be sure that "rewriting from scratch" is the easiest way to give your users those benefits.