The Calendar team is working thru plans for Meeting Delegation.
Thank you for your feedback! The team is planning for this work. We will share an update as soon as one is available.
For the separate feature ask to disable attendee audio, we are pleased to announce this has been released. For more information, please see this UserVoice item https://microsoftteams.uservoice.com/forums/555103/suggestions/39784519.
We are now preparing for the roll out of Tasks in Teams which will integrate additional features integrating To-Do and Planner. This includes additional list views that also extend to tabs in teams. Further announcements about additional integration in our overall Tasks coherence effort will follow.
You can follow the rollout via our Roadmap item: https://www.microsoft.com/microsoft-365/roadmap?searchterms=57213. To see a preview of the experience, please visit https://youtu.be/rTATVGroEsQ.