I completely agree. Threads in Slack should be a great way to make conversations easy to navigate but damn did they fsck up ever part of the UX:

- opening threads in a new window is in some hard to find and hard to remember location

- threads can’t be inlined (like you’ve described). I actually like how they’re in a pane to the right but sometimes that causes issues (as you’ve described). Sometimes it’s just that the view is too narrow.

- there’s no way to shift non-threaded comments into the thread. I’ve lost count of the number of times conversations have happened over multiple threads and/or non-threaded replies.

The way they implemented it is a complete clusterfuck.