Why did we move away from the logical threading to the new gmail-and-everyone-else style? The problem with emails is that you can reply to any email in a ’thread’. Seriously? You can even reply twice to the same email and create a new branch of replies. The new ‘conversation’ style of gmail and others just doesn’t take this into account. Admittedly, it works OK when everyone is using the conversation style, and only ever replies to the very latest email.