> the flow of information is the email just above It sometimes isn't. If you have long discussion threads with >10 people it's more akin to a graph than a link

> the flow of information is the email just above It sometimes isn't. If you have long discussion threads with >10 people it's more akin to a graph than a linked list. If all your emails only have (last received message in thread) as context, then you could probably even get away with a chat system instead of email threads. I guess that's why Slack became so popular, it's the common case.