I like the idea of a single rubric, the difficulty is that all of our assessment is due at the same time. It's probably easiest for our junior years for a single rubric as they are usually marked on the same criteria and scoring no matter which curriculum area.
Our senior years have a lot more variety to the point that one assessment criteria could be used for one assessment piece and the mark is 5, but the next assessment piece the same criteria is 10. This is where editing the criteria in a single sub account rubric will be difficult to manage because of the need to edit. (Assessment criteria and scores are set by our overarching curriculum body so we are unable to change the marking system).
Enhanced Rubrics provides such a different view when marking with more than five points - it can make it even more confusing for staff to mark appropriately given the scaling doesn't tend to end up matching the traditional format. As we are only at the start of our rubrics journey, the more we can make it look and feel as easy as possible and behave in a natural way the better.
We will keep testing some options, but I have a great IT team who have been able to import our assessment criteria/scores directly into Canvas and stored in the Rubrics navigation menu. This makes life a lot easier