I also came here to say this. My only guess is that the alphabetization (by the "learning management system") to make filling the grades into a table "easier" for the computer or for the person handing out the results? Why is it "easier" if the system doesn't have to order them at all, or it could do so by student number (same issue as alphabetical order) or something random, which is the other (non default) option for the "learning management system".
I feel like only the most obsessive compulsive humans would have this issue (without computer "help"), as the last thing I wanted to do as a TA was to add another step of ordering all the papers before grading them. I also always reviewed the first few papers I graded after grading the rest to make sure I was being fair, because it was obvious to me that until I saw a representative distribution of answers I couldn't do fair grading/marking.
I feel like only the most obsessive compulsive humans would have this issue (without computer "help"), as the last thing I wanted to do as a TA was to add another step of ordering all the papers before grading them. I also always reviewed the first few papers I graded after grading the rest to make sure I was being fair, because it was obvious to me that until I saw a representative distribution of answers I couldn't do fair grading/marking.