Yeah, this is so frustrating. For those of us who want to use Teams as a way to manage projects for our team, that means using Planner for the task portion, but w/o this feature, it's not really usable.
Having said that, I get that this is probably a very difficult change to make. The description and comment fields are just plain text. That's a very different data model from being able to store complex data, which is effectively the text, plus attachments, plus a whole bunch of metadata to indicate how to display it. If not built this way in the first place, it's probably quite challenging to change. And, if you think of Planner's origins, I bet they were thinking more about notes on tasks in something like MS Project -- a fantastic project management tool -- that also does not support this and probably couldn't without an entire rewrite. The difference is that MS Project is not really intended as a communication tool, except for status/date updates. In contrast, many of us want to use the comments in Planner like an ongoing chat on the task, like people have used Trello, Jira, Asana, etc. for years. MS completely dropped the ball by not recognizing that was the proper comparison, not MS Project.
Still, glad that the date for this feature landing got updated. Sep of this year, while depressing, is at least believable. Maybe that does indicate they're working on it and are just having trouble, so needed to push out the delivery date to something more realistic.
