Personally I cannot stand threaded messaging - maybe it’s the IRC user in me, but I cannot stand having new messages randomly pop up at random points instead of at the bottom. If you have a discussion that is longer term or needs a separate context then spin it off to a different/new channel, otherwise I’ll spend forever searching for it again anyway.

This is an UX problem. There's supposed to be a list of threads so that you can find the one you're looking for easily. A thread is essentially a lite channel which shares all of the members of the original channel automatically.

god I have hundreds of threads and I hate it....

Mattermost has both! Messages always appear in sequence. Replies in a thread are visually identified as reply including the thread it is part of. This way you can do both grouping of discussions and follow the discussions from higher over.

I don't understand this post, are you saying threaded messaging in Slack is good?

Threads are deal killer for Slack.

Twist is kinda unreliable and flaky.

But I'll put up with anything to get sane threading.