Assignment & rubric database
Assignment Rubrics in Teams is great. But if you really want a snazzy point of difference to other platforms then it would be great if there was an easy way to export the whole assignment description along with rubric to some sort of central Microsoft database.
When exporting you would also add tags such as Grade 1 Math Australian Curriculum etc.
I imagine also that you might have the option for the rubric only to be viewable by your specific organisation as some people don't like sharing beyond their school.
A great place to start might be by buying out Rubistar http://rubistar.4teachers.org Update the website so it's still free, but there's the option to add any task to Teams Assignments.
Rubistar is full of hundreds of thousands of rubrics, just the search function is outdated