Email is not designed to be a message queue. Applications (and business processes) should not be built on email. You have bugs in a program? Get a bug tracker.

Email is not designed to be a message queue. Applications (and business processes) should not be built on email. You have bugs in a program? Get a bug tracker. You need to handle your accounting? Get a web app for that. Email is not broken because it doesn't do enough. Email is broken because people use it for too much. Do you need to view every process that you interact with in your life in step-by-step flat text messages? No. While the usefulness of aggregating all of those messages in one place may be debatable, I don't think that it belongs in your email account. Email should be treated as an asynchronous communication medium for people only.