They are something new. They're a solid more approachable packaged solution which includes them in a form more available to the general programmer. And popula

They are something new. They're a solid more approachable packaged solution which includes them in a form more available to the general programmer. And popularised by Google. Yes, these things have been used in the past. No-one denies that, and there are copious references where Stackless was based on Limbo. Every time something new comes up which uses old technology, there's always those who have to assume it means that it insults the old adopters in some way. Or that fealty has to be paid to the old adopters. At some level this becomes tiresome and unhelpful.