I would like to assign letter grades to my grading scheme without having to create an arbitrary points system. So, for example, a writing assignment would get a letter grade (A-, C+, whatever) and then the four writing assignments I have over the course of the semester will total 25% of the final grade. I do not want to have to assign points detailing what each writing assignment is worth (should it be 3 points? 26 points? 142 points??), I just want to say "A-".
Why can this not be done in Canvas?