But also, critically, if you want to, you can drop back to the "show me everything sequentially" view. Threads hide discussions away - which is good when you want to focus on something else, but bad when you can't remember where a discussion was.
The killer feateure is that it's very easy to move last $x messages to another topic, so if someone writes a short note that begins a conversation everyone is free to reorganize it, and also moving messages between threads is easy and nice.
But also, critically, if you want to, you can drop back to the "show me everything sequentially" view. Threads hide discussions away - which is good when you want to focus on something else, but bad when you can't remember where a discussion was.