Thank you for writing the article that I can from now on share to explain the use of threads to my team. It covers so many great points and make the value of a little thought and discipline with threads pretty clear. I included it in a little course I wrote about how to use Slack: https://trickle.app/drip/11046-answering-messages-in-threads/
An idea I had to softly encourage (and train) a team to use threads is to agree on a certain Emoji reaction that can be added to messages in the main channel that would rather belong in a thread. What do you think of such a technique?