This morning I noticed that if I look at a given student's grades for a manually graded assignment, and click on the info icon, Canvas does report the same kind of statistics as it does for auto-graded m/c quizzes.
However, there seems to be no way for me to see the statistics for the assignment in the grade book (or any other place). Furthermore, unlike for auto-graded quizzes, no histogram of the grades seems to exist anywhere (for manually graded assignments).
I agree with everyone who has said this really has to be a top priority.
A close second one should be not to force users to select avatars that look as if they are designed for 12-year olds, or to turn off emojis for comments, or disable confetti... etc.
Canvas really needs to develop a "Pro" 21st century version for Higher Ed.