The problem with email is that it's no longer a communication tool but a representation of the things you need to do. If it was just about communication, then that's one thing, but that's not what it is anymore. That's why you see so many people email themselves or say "yeah email me to remind me". But when you go down that path it's just an unorganized firehose. If we're stuck with communication tools representing "what we need to do", shouldn't we be building better tools to support that rather than saying "eh it's good enough"?