There are many teachers who grade on a 4 point rubric. They will have multiple criteria that they are grading on an assignment that are all graded on a 4 point rubric. Teachers will then average the scores of all the rubrics to achieve a final score that is out of 4. It would be nice if you could set your point total to 4 in an assignment but have all the criteria in your rubric. Then when you are done grading Canvas will average the criteria and generate a final score out 4. I know this is capable in Google Classroom, but my school doesn't use that anymore.