I don't really see how MS teams is a "high quality product". We have been forced to move from Slack To Microsoft teams in the past month. And I'm already missing it. Even though that Slack's threads were a mess, at least they always appeared in chronological order. Now in teams I miss a lot of messages because the way it reorder them when someone respond to an old thread.

TBH the feature I miss the most, is reacting to a certain message with emojis! It added liveliness to the whole chat.