Overview
Just because someone has a 'different' idea does not mean that it's a better idea. Independent thought should always be encouraged, but tried-and-true ideas become tried-and-true for a reason. If you feel that someone is wasting time by trying to re-invent the wheel today, say so. Do not worry if people accuse you of being closed-minded. Chances are, they will end up being grateful for the reality check you provided.