Just two points: - That's why I prefer to think about protocols, as opposed to a system (i.e. global implementation of one or more generalized protocols) - Yo

Just two points: - That's why I prefer to think about protocols, as opposed to a system (i.e. global implementation of one or more generalized protocols) - You don't always have to solve the problem theoretically; solving it practically may be good enough. A system can be usable for a long time, before it collapses under abuse.