Thank you for your continued feedback. The feature team is actively working on this highly requested feature. We are testing the first release that will have the ability for meeting hosts to create breakout rooms, assign the users to the rooms and call them back to the main room. Please see our roadmap for current status here: https://www.microsoft.com/microsoft-365/roadmap?filters=Microsoft%20Teams&searchterms=65332.
Thank you for your continued feedback. As many people have pointed out, this is available on mobile today. Support for replying to a specific message is on the backlog for desktop. I’ll let you know when we have progress to share. Thanks.
Thank you for your feedback. The ability to enable and disable meeting chat in a meeting is on the backlog. We will share an update as soon as one is available.