Slack usability has steadily been decreasing over time.
On desktop I am not getting the "unread" grouping but mobile I do.
The drafts feature is on both and can't be disabled.
Both of them break habits of where my channels are. It is terrible UX.
The "threads" feature on the sidebar allows you to reply to a thread but if you get a counterreply you need to click to see it. A better flow can be found if you click the channel name on top of the thread -- there's no indication like a timestamp or anything this jumps you to the thread in the channel -- and then click the thread link in-channel and then answer in the sidebar -- now the conversation flows without further clicks. Do I need to mention how terrible UX this is?